ANSWER THIS CORRECTLY.
Theo factored a greatest common factor (GCF) of 4x^2y from the expression 12x^2y^3-20x^3y^2+32x^4y. What error did Theo make, if any?
A. Theo could have factored an additional x variable from the expression
B. Theo could have factored an additional y variable from the expression.
C. Theo could have factored a higher coefficient from the expression.
D. Theo didn't make an error. He factored the correct GCF.