The answer is: They’re
They’re is they + are
Answer:
It looks like a simile is used, "dry as a biscuit,". It's comparing how dry something is to how dry a biscuit is.
I'm not sure about the rest, because I don't have context clues, but it looks like that's the only figurative language.
The answer should be D as Tesla was a compelling scientific figure indeed. He wanted to provide the electricity to the world for free.
