Question

"What's the big deal" asked Rome I think I can use a period since it's quote instead of question mark

Answer 1

You'd use a question mark, since it's in the form of a question

Answer 2

unless you're referring to the end of the entire line, then its a period

Answer 3

i prefer question mark

Answer 4

Agreed

Answer 5

Anything that starts with what, who, why, where, when will be equipped with question mark at the end of sentence.

Answer 6

This is a rule. It's not a matter of whether you prefer it or not.

Answer 7

okay, thanks!