It's b I think but if I'm wrong my b
A. To do whatever he wants them to do.
A sentence fragment is a sentence that is incomplete, one that is separated from the main claus. In this case "To" is a preposition, which means that there should be more to the sentence. You can tell because you can't fully understand the idea behind the sentence. Therefore A, is the fragment.
Answer:
I'm pretty sure its participial
Explanation: