Given two functions j(x)=−3x+2 and k(x)=3+4x , what is the function rule for (kj)(x) ?

A. (kj)(x)=−12x^2+18x+6

B. (kj)(x)=−12x^2+x−6

C. (kj)(x)=−12x^2−x+6

D. (kj)(x)=12x^2−18x−6