I'd say, the correct option to the first question is B. Argument:
It says that he could drink an entire river, eat a trillion beans and a silo full of grains. It was also said that he washed that all down with a cup of milk, AS IF HE WAS A DRAIN. So, in other words, he ate a lot to later just wash everything down with a cup of milk like a drain.
Therefore, the answer is:
B.
The second question shouldn't be too tricky:
The hyperbole is a type of figurative language that is used by the writer to exaggerate what wants to be said, and that is clearly what is being done.
Answer:
A.
Hope it helped,
BioTeacher101