In problems 1-12, decompose the fractions: (3x3+3x2)/(x2+x-2). Which of the following options correctly decomposes the fraction?
A. (3x2(x+1))/(x+2)(x-1)
B. (3x2(x+1))/(x2+x-2)
C. (3x3+3x2)/(x+2)(x-1)
D. (3x3+3x2)/(x2+x-2)