Which of the following statements uses an idiom a. were starting to think the cat had gotten her tongue b. with a crack! of thunder, the storm began overhead. c. treat others the way you would like to be treated. d. the candies in that first barrel cost a dollar for a dozen.

A. were starting to think the cat had gotten her tongue

Explanation:

An idiom is a sentence whose meaning cannot be inferred from the literal meanings of each word. The idiom "has the cat got your tongue?" is well-known and it is a question usually asked to someone who is silent and refuses to speak even when addressed.

Other famous idioms are:

to beat around the bush

to cut someone a slack

to pull somebody's leg

to be under the weather

expository writing is one of the most common types of writing.