Hi, Only #2 is correct grammar. What do you mean, 'I saw the sentence in a movie'? Was it written as a sub-title?
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Anonymous"Is this about the Avengers? Which I know nothing about." I saw the sentence in a movie, but I think that"Is this about the Avengers, which I know nothing about?" is a better sentence. What do you native English speakers think? Thank you a million in advance.Your revision is correct for written English.