Simplify (-2x3)2 · y · y9.

Square each factor inside the parentheses: (−2x³)² = (−2)²x⁶ = 4x⁶. Then combine the y factors by adding their exponents: y · y⁹ = y¹⁰. The simplified expression is 4x⁶y¹⁰, which is choice C.

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