Let $x = 2 u + v$ And $y = u - 2 v$

Multiple Choice

Let $x = 2 u + v$ and $y = u - 2 v$ Then $\frac { \partial ( x , y ) } { \partial ( u , v ) }$ is

A) $- 6$
B) $- 5$
C) $- 4$
D) $- 3$
E) $- 2$