Verb is your answer, it describes an action such as (running, jumping, laughing...)
Not ad hominem, because that has to be directed at a person. Probably not a red herring, because that involves misdirection and clues, which seems out of order for this type of work. Poisoning the well involves making further phrases seem stupid or pointless by statements made to start. A slippery slope is an action or idea that leads to problems and issues to come, and in this case i think that applies.
I think A is the best possible answer for this question.
Answer:
The girl, who had beautiful hair, was a fierce and strong warrior.
Explanation:
an adjective modifies a noun or pronoun by describing qualifying or limiting and answers the questions what kind, how many, which, and whose. write that down i've found that it has helped a lot! Also if you need 2 commas just add a who/ which clause in the middle of the sentence :)