Meaning: 'Initiated' means to begin or start something, in this case, social reforms.

Wrong options:

• changed: The word 'changed' is a verb that implies alteration rather than the act of starting, which does not fit the context of initiating reforms.
• though: The word 'though' is a conjunction used to introduce a contrast, which does not fit grammatically or contextually in this sentence.
• entailing: The word 'entailing' is a gerund that suggests a consequence or requirement, which does not fit the context of starting reforms.
• such: The word 'such' is a demonstrative adjective that refers to something previously mentioned, but it does not convey the action of starting reforms.
• using: The word 'using' is a gerund that indicates the act of employing something, which does not fit the context of initiating reforms.

Correct answer: using

Explanation: The word 'using' is a gerund that fits grammatically as it describes the action of employing statistical control tools. It is contextually appropriate as it follows the structure of the sentence discussing how manufacturers can improve products.

Meaning: 'Using' means to employ or utilize something, in this case, statistical control tools.

Wrong options:

• initiated: The word 'initiated' is a verb that implies starting something, which does not fit the context of employing tools.
• changed: The word 'changed' is a verb that suggests alteration, which does not fit the context of using tools.
• entailing: The word 'entailing' is a gerund that implies a consequence, which does not fit the context of employing tools.
• such: The word 'such' is a demonstrative adjective that does not convey the action of employing tools.
• through: The word 'through' is a preposition that indicates a means or method, but it does not fit the grammatical structure needed here.

Correct answer: such

Explanation: The word 'such' is a demonstrative adjective that fits grammatically as it introduces examples of statistical control tools. It is contextually appropriate as it refers to the control charts mentioned.

Meaning: 'Such' refers to specific examples or types of something previously mentioned, in this case, control charts.

Wrong options:

• initiated: The word 'initiated' is a verb that does not fit as it does not describe a type or example of tools.
• changed: The word 'changed' is a verb that implies alteration, which does not fit the context of providing examples.
• using: The word 'using' is a gerund that describes an action, not a demonstrative adjective for examples.
• entailing: The word 'entailing' is a gerund that suggests a consequence, which does not fit the context of providing examples.
• through: The word 'through' is a preposition that indicates a means, but it does not serve to introduce examples.

Correct answer: through

Explanation: The word 'through' is a preposition that fits grammatically as it indicates the means by which legislators can justify laws. It aligns with the context of discussing how statistical analysis aids in law justification.

Meaning: 'Through' means by means of or via, indicating the method used for analysis.

Wrong options:

• initiated: The word 'initiated' is a verb that does not fit as it does not indicate a means or method.
• changed: The word 'changed' is a verb that implies alteration, which does not fit the context of indicating a method.
• using: The word 'using' is a gerund that describes an action, not a preposition indicating means.
• entailing: The word 'entailing' is a gerund that suggests a consequence, which does not fit the context of indicating a method.
• such: The word 'such' is a demonstrative adjective that does not convey the means by which something is done.