Correct Answer: very slowly

Solution : The correct answer is the third option.

Explanation : Idioms are phrases or expressions that convey a figurative meaning different from the literal interpretation of the individual words. In this case, the idiom "at a snail's pace" means moving very slowly, often used to describe a slow and leisurely pace. The correct option, very slowly, aligns with the figurative meaning of the idiom. Snails are known for their slow movement, and the idiom captures this characteristic to describe a sluggish or unhurried pace.

Therefore, the correct meaning of the idiom is very slowly.