For the Overall Reaction a + 2B ? C, Which $\rightleftharpoons$

For the overall reaction A + 2B ? C, which of the following mechanisms yields the correct overall chemical equation and is consistent with the rate equation below? Rate = k[A][B]

A) A + B $\rightleftharpoons$ I (fast)
I + A ? C (slow)
B) A + B ? I (slow)
I + B ? C (fast)
C) 2B ? I (slow)
A + I ? C (fast)
D) 2B $\rightleftharpoons$ I (fast)
I + A ? C (slow)
E) A + 2B $\rightleftharpoons$ I (fast)
I + B ? C + B (slow)