B is the most likely answer
Answer:
Parallel structure (also called parallelism) is the repetition of a chosen grammatical form within a sentence. By making each compared item or idea in your sentence follow the same grammatical pattern, you create a parallel construction. Example Not Parallel: Ellen likes hiking, the rodeo, and to take afternoon naps.
Explanation:
D, "their." Since you're talking about two of them, it's plural. The sentence:
Neither Carol nor Ellen would hesitate to share their supplies with you.
