Find the Coefficient of the Term Containing A ⁴ $( \sqrt { a } - \sqrt { x } ) ^ { 16 }$

Multiple Choice

Find the coefficient of the term containing a ⁴ in the expansion of $( \sqrt { a } - \sqrt { x } ) ^ { 16 }$ .

A) 12,870
B) 495
C) 12,871
D) 25,740
E) 1,839