Select the most appropriate meaning of the given idiom.
"Dot the I's and cross the T's"

The correct answer is (a) To do something carefully.
Explanation:
The idiom "Dot the I's and cross the T's" means to pay careful attention to details, ensuring that everything is done meticulously. It originates from the need to carefully form letters in handwriting, where attention to even small details is required.
Meanings of all options:
· To do something carefully: To carry out an action with attention to detail and precision.
· To make a bad situation worse: To exacerbate or worsen a problem.
· To have no standard of beauty: To lack a specific preference or criterion for appearance.
· To complain about something: To express dissatisfaction or grievances.