Answer :

Definitely a hyperbole. Hyperboles are extremely exaggerated statements. 
Saying someone snores louder than a freight train is impossible but it's VERY exaggerated. Therefore, it's a hyperbole. 

The figure of speech used here is hyperbole.

What is a hyperbole?

This is an exaggerated statement not meant to be taken in its literal sense.

In the statement, snoring louder than a train is an exaggerated statement as no human's snore is louder than that of a train.

There correct answer is option D.

Read more about hyperbole here:

https://brainly.com/question/2351925