'Before they ate a snack' is the correct answer, it is the adverbial clause of time. A cannot be correct because that is an independent clause, and adverb clause has to be dependent. B isn't a clause at all.
Mythological characters,places, and titles
Answer:
You need to type it like you're saying it's a 7th grader? What's the question?
Explanation:
B she was a difficult relationship with her manager