A.I. Explanation:

Correct answer: addressed

Explanation: The word 'addressed' fits grammatically as it is the past participle form of the verb 'address,' which is appropriate in this context to indicate that the vision impairment issue could have been dealt with or resolved. It aligns with the overall context of discussing preventable vision impairments.

Meaning: 'Addressed' means to deal with or take action on a particular issue or problem.

Wrong options:

• determined: 'Determined' is the past participle of 'determine,' which means to establish or ascertain something, but it does not fit the context of resolving an issue.
• cost: 'Cost' is a noun that refers to the amount paid for something, which does not relate to the action of resolving or dealing with vision impairment.
• case: 'Case' is a noun that refers to an instance or example of something, which does not fit as a verb in this context.

Correct answer: absence

Explanation: The term 'absence' is a noun that indicates the lack of something, which fits grammatically and contextually as it describes the situation where timely detection is missing. It is essential to convey the idea that without timely detection, negative consequences can occur.

Meaning: 'Absence' refers to the state of being away or not present, in this case, the lack of timely detection.

Wrong options:

• determined: 'Determined' is an adjective that means firmly decided, which does not fit as it does not describe a state of being.
• cost: 'Cost' is a noun that refers to the price of something, which does not relate to the context of detection.
• case: 'Case' is a noun that refers to a specific instance or example, which does not fit the context of lacking timely detection.

Correct answer: productivity

Explanation: The word 'productivity' is a noun that refers to the effectiveness of productive effort, which fits grammatically as it serves as the object of the sentence. It is relevant in the context of discussing how reduced eyesight can lead to lower levels of work output.

Meaning: 'Productivity' refers to the rate at which goods are produced or work is completed, indicating efficiency in work.

Wrong options:

• determined: 'Determined' is an adjective that does not fit as it does not relate to a measure of work output.
• cost: 'Cost' is a noun that refers to the amount of money required for something, which does not fit in the context of work output.
• case: 'Case' is a noun that refers to a specific instance, which does not relate to the concept of work efficiency.