If $\begin {align*}I_1 = \int_0^1 2^{x^2} \; \; dx , I_2 = \int_0^1 2 ^{x^3} \;\; dx, I_3 = \int_1^2 2^{x^2} \; \; dx \; and \; I_4 = \int_1^2 2^{x^3} \;\; dx, \end{align*}$ then :

Question

( A ) $I_2 > I_1$
( B ) $I_1> I_2$
( C ) $I_3 > I_4$
( D ) $I_3 = I_4$