As many as 300 of the 720 paintings attributed to Rembrandt may actually be the works of his students or other admirers. (A) the 720 paintings attributed to Rembrandt may (B) the 720 paintings attributed to be Rembrandt’s might (C) the 720 paintings that were attributed to be by Rembrandt may (D) the 720 Rembrandt paintings that were once attributed to him might (E) Rembrandt’s paintings, although 720 were once attributed to him, may

Author is uncertain and hence I think "may" is required. I think A should be the answer.

X is attributed to Y B & C out as they insert to be C uses passive voice and we can avoid it for another reason D & E sound awkward. A is my pick.

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