Find the Coefficient $a$ Of the Term in the Expansion of the Binomial

Multiple Choice

Find the coefficient $a$ of the term in the expansion of the binomial.
$\begin{array}{ll}\text { Binomial } & \text { Term } \\ (2 x-5 y) ^{7} & a x^{2} y^{5}\end{array}$

A) $a = 12$
B) $a = - 262,500$
C) $a = 14$
D) $a = - 78,125$
E) $\quad a = 2520$