Take a look at the sentence again:
Elizabeth wanted to enjoy the plate of nachos that she and Jared shared,
but she worried about black beans sticking to her teeth, cheese dripping
from her chin, and __________.
The blank requires a noun followed by a participle phrase. You chose the possibility that chip crumbs might catapult from her mouth, which is a noun followed by a subordinate clause. You thus have a parallelism error. Before you continue, review the rules for parallel structure.
Go back to the sentence to try again.