Multiply the expressions: \((4x^2 + 7x)(5x^2 - 3x)\).

A. \(20x^3 + 35x^2 - 21x^2\)

B. \(20x^4 + 23x^3 - 21x^2\)

C. \(20x^4 + 23x^2 - 21\%\)

D. \(20x + 35x^2 - 21x\)