Which expression is equivalent to 7a2b + 10a2b2 + 14a2b3?

The greatest common factor of 7a²b, 10a²b², and 14a²b³ is a²b. Factoring it out leaves 7, 10b, and 14b², so the expression becomes a²b(7 + 10b + 14b²). This matches choice B.

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