Find the Coefficient a of the Term in the Expansion $( 2 x - 5 y ) ^ { 8 }$

Multiple Choice

Find the coefficient a of the term in the expansion of the binomial. Binomial Term $( 2 x - 5 y ) ^ { 8 }$ $a x ^ { 3 } y ^ { 5 }$

A) $a = - 224000$
B) $a = 336$
C) $a = 40$
D) $a = 8$
E) $a = 390,625$