Meaning: 'Developed' refers to the process of treating a photographic plate or film to make the latent image visible.

Wrong options:

• unraveled: 'Unraveled' means to untangle or solve something, which does not apply to the context of processing a photographic plate.
• overlapped: 'Overlapped' refers to covering or extending over something else, which is irrelevant in the context of developing a photographic plate.
• transmitted: 'Transmitted' means to send or convey something, which does not fit the context of processing a photographic plate.

Correct answer: fogged

Explanation: The word 'fogged' is appropriate as it describes the condition of the photographic plate after development, indicating that it has become cloudy or obscured due to exposure to radiation. This fits both grammatically and contextually, as it describes the result of the development process.

Meaning: 'Fogged' means that the photographic plate has become unclear or cloudy, typically due to exposure to light or radiation.

Wrong options:

• transparent: 'Transparent' means clear and see-through, which contradicts the idea of the plate being affected by radiation.
• corrugated: 'Corrugated' refers to a surface that is shaped into alternating ridges and grooves, which does not apply to the condition of a photographic plate.
• clarified: 'Clarified' means made clear or easier to understand, which is not relevant to the context of the photographic plate's condition.

Correct answer: coined

Explanation: The word 'coined' is the correct choice as it refers to the act of inventing a new term or phrase. It fits grammatically in the past tense and contextually as it describes how Marie Curie introduced the term 'radioactivity' to the scientific community.

Meaning: 'Coined' means to create a new word or phrase, particularly in a formal or official context.

Wrong options:

• concocted: 'Concocted' implies creating something by combining various elements, often with a negative connotation, which does not fit the formal introduction of a scientific term.
• expected: 'Expected' means anticipated or predicted, which does not relate to the act of creating a term.
• estimated: 'Estimated' refers to making an approximate calculation or judgment, which is not relevant to the creation of a term.

Correct answer: discovery

Explanation: The word 'discovery' is suitable as it refers to the act of finding or uncovering something new, which aligns with the context of radioactivity being a new scientific phenomenon. It fits grammatically and contextually as it describes the significant finding that led to the Nobel Prize.

Meaning: 'Discovery' means the act of finding or learning something for the first time, particularly in a scientific context.

Wrong options:

• fabrication: 'Fabrication' implies creating something false or misleading, which does not apply to the genuine finding of radioactivity.
• invention: 'Invention' refers to creating something new that did not exist before, which is not the same as discovering something that already exists.
• discharge: 'Discharge' means to release or let go, which does not fit the context of finding or uncovering a scientific phenomenon.