The answer to your question would be that the version of the sentence that has correctly placed commas is the following one: Noah, who draws comic books in his free time, wants to write a graphic novel. That is, your answer would be option A.
The clause set off with the commas is a non-restrictive relative clause. This means that it provides information which is considered non-essential to the meaning of the sentence and therefore can be dropped without altering its meaning. That is why they are set off with commas, parentheses or dashes.
Formal principle because formal means "used to be" so the ex principal would be the FORMER principal. he's not principal.
