Meaning: 'Complex' means something that is made up of many interconnected parts, making it complicated or intricate.

Wrong options:

• plant: 'Plant' refers to a living organism and does not fit the context of describing machinery, which is typically not living.
• domestic: 'Domestic' relates to home or household matters, which does not accurately describe the machinery being discussed in a broader context.
• commercial: 'Commercial' pertains to business or trade, which is not the primary focus here as the sentence emphasizes the nature of machinery rather than its commercial aspect.

Correct answer: imaginations

Explanation: The word 'imaginations' is appropriate as it refers to the creative capacity of individuals, which aligns with the context of discussing products of the mind. It fits grammatically as a plural noun that complements 'people's minds'.

Meaning: 'Imaginations' refers to the ability to form new ideas or images that are not present to the senses, highlighting creativity.

Wrong options:

• bodies: 'Bodies' refers to physical forms and does not relate to the mental or creative aspects being discussed.
• brains: 'Brains' refers to the physical organ and does not capture the creative aspect implied in the context.
• brings: 'Brings' is a verb and does not fit grammatically as it does not serve as a noun to match with 'products of people's minds'.

Correct answer: inventor

Explanation: The term 'inventor' is suitable as it directly refers to a person who creates new products or ideas, fitting the context of discussing rights over inventions. It is a singular noun that aligns with the subject of the sentence.

Meaning: 'Inventor' means a person who devises or creates something new, particularly in the context of technology or ideas.

Wrong options:

• scientist: 'Scientist' refers to someone who studies or practices science, which does not specifically denote the act of invention.
• artist: 'Artist' refers to someone who creates art, which is not the focus of the sentence discussing inventions.
• discoverer: 'Discoverer' implies finding something that already exists rather than creating something new, which does not fit the context.

Correct answer: disseminated

Explanation: The word 'disseminated' fits grammatically and contextually as it means to spread or distribute widely, which is essential for inventions to be utilized. It is a verb that aligns with the action required for inventions in the sentence.

Meaning: 'Disseminated' means to spread or disperse information or ideas widely, indicating the importance of sharing inventions.

Wrong options:

• known: 'Known' implies awareness but does not convey the action of spreading or sharing, which is crucial in this context.
• found: 'Found' suggests discovery rather than distribution, which does not align with the intended meaning of making inventions widely available.
• explained: 'Explained' refers to clarifying something, which does not capture the essence of spreading inventions as 'disseminated' does.

Correct answer: conflict

Explanation: The term 'conflict' is appropriate as it describes a struggle or disagreement between two needs, fitting the context of balancing incentives for discovery and limitations. It is a noun that aligns with the overall theme of the sentence.

Meaning: 'Conflict' refers to a serious disagreement or struggle, particularly in the context of competing needs or interests.

Wrong options:

• quarrel: 'Quarrel' implies a verbal dispute, which is too informal and does not capture the broader implications of the struggle discussed.
• discourse: 'Discourse' refers to written or spoken communication, which does not fit the context of a struggle between needs.
• paradox: 'Paradox' refers to a statement that contradicts itself, which does not accurately describe the situation of competing needs.