Answer:
Tara would have sung in the competition if she had not gotten sick.
Explanation:
This type of mood states conditions that are opposite of the reality or even imaginary.
Hope this helps you!
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.
They could die, cross-contamination from earth, e.t.c