Answer:
"The novels"
Explanation:
Great question, it is always good to ask away and get rid of any doubts that you may be having.
Based on the sentence, we can see it is mentioning an object that belongs to Willa Catha. Unfortunately, all of them can be possible correct answers based on that information so we need to check which ones make the sentence factually and grammatically correct.
Therefore the only answer that makes this sentence both factually and grammatically correct is the last answer "The novels".
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