Find the Coefficient a of the Term in the Expansion $( x - 7 y ) ^ { 10 } ~a x ^ { 8 } y ^ { 2 }$

Multiple Choice

Find the coefficient a of the term in the expansion of the binomial.​ Binomial Terms
$( x - 7 y ) ^ { 10 } ~a x ^ { 8 } y ^ { 2 }$ ​

A) 2,208
B) 2,204
C) 2,206
D) 2,205
E) 2,203