Which two sentences use literary devices?

The cat leaped over the table and broke an expensive vase.
Outside, the torrential rain poured like a waterfall.
In the summer, we can wear lightweight clothing.
Cleaning his bedroom is a Herculean task for Robert.
I prefer to read printed newspapers instead of news on the internet.

Option 2 and option 4.

Explanation:

In option 2, the phrase "like a waterfall" is a simile. The word "like" followed by the comparison of something exaggerated is usually a giveaway to determine a simile.

In option 4, the phrase "Herculean task" can be classified as either an idiom or an allusion (or both). An idiom is an exaggeration of something and an allusion is when a phrase relates something to a work of literature. In this case, it's relating to the story of Hercules.