Do you have to use words from the back? I feel like none of them fit.
If not, then I'd fill the blank with "range". If yes, then I'd use "spectrum" or "repetoire", though neither of those are a perfect fit.
Answer:
D. but these are actually night terrors, which are not dreams but episodes that occur in non-REM sleep
Explanation:
Answer D
Correct. The writer wants to offer a contrasting perspective to the idea that some parents have seen their young children having nightmares. By explaining that the children are actually experiencing night terrors, which are not dreams, the writer demonstrates that there is a contrasting perspective to the parents’ viewpoint.