The area in square units bounded by the curves $y = x^3,\; y = x^2$ and the ordinates $x=1, \; x=2$ is equal to

Question

( A ) $\frac{17}{12} sq. unit$
( B ) $\frac{2}{7} sq.unit$
( C ) $\frac{12}{17} sq. unit$
( D ) $\frac{7}{2} sq.unit$