Which of the following contains an idiom

I thinks its 1

Explanation:

An idiom isn’t realistic and to me “Traffic was moving at a snail’s pace” is an idiom.

sorry i was thinking about it but its one

Explanation:

answer: group ii. when the root is a full word except for a final e, the forms usually are spelled with -able.

explanation: the word will be deplorable. -able will be used with the word 'deplore-'. the group ii is when the root is a full word except for a final e, the forms usually are spelled with -able is used for the word deplore- because the word deplore- has 'e' at the end of it.

i would pick a. i think this is more of a personal question though.