The correct way to complete the sentences is:
Bernadette's research question (Option B) needs to be improved. She can improve it by Broadening her research question (Option D)
The correct way to phrase the research question is: to ensure that:
Hence, it is correct to state that the right way to complete the sentences is: that Bernadette's research question (Option B) needs to be improved. She can improve it by Broadening her research question (Option D).
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