Answer:
Unbelievable is the answer.
Explanation:
'In' means not, cred is the part of the root, and able means capable.
If you add them together, you get <u>not capable to be believed</u> or unbelievable.
A pronoun is a proper noun. Like a name, name of a company or referring to self “I”
It probably could be in question format but it most likely isn't since it is called a thesis STATEMENT, not a thesis question.