An SAT grammar question

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Senior Member
Choose the one word that is NOT grammatically correct.
What is new (A)are some reports based on the finding that the changes may be (B)noticeable by the 1990s, (C)much sooner than previously (D)expected.
Which one is wrong?
Is it (A)? Does it have to be "is"? That's the only option I can think of but I suspect that the subject of the sentence is "some reports", in which case "are" is correct. What do you say?
Thank you!
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