Answer: The answer is C. because making the topic more amusing would help in making the topic less uncomfortable. Hope this helps :)
Explanation:
Yes. The sentence with correct parallel structure would be as follows. The doctor known only that her patient would improve, but also knew that her patient would [can't understand the sentence after that, but nevertheless it is still faulty].
am, is, are, was, were, being, been.
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To inform because of the please help me out and say the is the right answer bro