A student factored 30x^7y² + 10xy as 10xy (3x^6y). What went wrong? Factor correctly.
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Select the correct choice below and fill in the answer box to complete your choice.

A. The factor 10xy is not a common factor. The correct factored form is 30x^7y² + 10xy = □

B. The common factors for the variable terms x and y are not correct. The correct factored form is 30x^7y² + 10xy=□

C. The expression inside the parentheses is not correct. The correct factored form is 30x^7y² + 10xy=□

D. The common factor for the coefficients, 10, is not correct. The correct factored form is 30x^7y² + 10xy =□​