A and E can be eliminated since both use 'which' (can only be used to refer back to noun immediately before comma)
C has a pronoun 'they' which introduces ambiguity in the sentence and has no clear antecedent.
You can replace 'they' with 'the movie' in option 'C' and it will still make sense.
'D' introduces reported which causes parallelism error 'have been sighted' before the comma must be parallel to what comes after more than.
This leaves us to option 'B' which is correct.
C has a pronoun 'they' which introduces ambiguity in the sentence and has no clear antecedent.
You can replace 'they' with 'the movie' in option 'C' and it will still make sense.
'D' introduces reported which causes parallelism error 'have been sighted' before the comma must be parallel to what comes after more than.
This leaves us to option 'B' which is correct.
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