Answer:
The answer is A the first one
The right answer is C). Ramy is challenging Charlotte to reconsider her assumption.
An oxymoron is contradicting words (deafening silence, jumbo shrimp, etc), a paradox is contradicting ideas (I must be cruel to be kind)
Personally, I would phrase it like this:
The choir moved the audience to tears with their beautiful voices.
Simile to compare his hair to a mule's tail.