Select the most appropriate option that can substitute the highlighted segment in the given sentence.
I visited the hospital to enquire about eyes surgery.

Correct option is A

The correct substitution of the highlighted words is (a) enquire about eye surgery.
Explanation:
The noun “surgery” is uncountable in this context and refers to a medical operation, which should be used in its singular form. “Eyes surgery” is grammatically incorrect because "eye" here is used as an attributive noun (adjective-like role) to describe the type of surgery.
Also, “enquire” is correctly used in the present form to indicate a general purpose visit.
Correct sentence: I visited the hospital to enquire about eye surgery.
Grammatical rule used:
When a noun is used to modify another noun (as an adjective), it is kept in singular form (e.g., eye surgery, car race, student loan).
Also, ‘enquire about’ is the correct phrasal use for seeking information.
Example:
He enquired about admission procedures at the college.