Select the most appropriate option to fill in the blank.
He complained ___________ his weak eyes.

Correct option is D

The correct option to fill in the blank is "about."
Explanation:
· The correct preposition to use with "complain" when referring to a problem is "about."
· Correct sentence: He complained about his weak eyes.
Prepositional Rule:
· Complain about → Used when expressing dissatisfaction regarding something.
· Complain of → Used when referring to physical pain or illness.
Incorrect Options:
· (a) Because – Incorrect preposition, "because" is used to indicate a reason, not an object of complaint.
· (b) Without – Doesn't fit contextually.
· (c) For – "Complain for" is incorrect usage; "for" is not used after "complain" unless referring to someone’s behalf (e.g., I complained for my friend).
Example:
· She complained about the poor service at the restaurant.