Let $x = - 3 , y = 7$ And $z = - 1$

Multiple Choice

Let $x = - 3 , y = 7$ and $z = - 1$ Evaluate the expression to find $D$ $$D = x y z$$

A) $D = - 21$
B) $D = - 49$
C) $D = 21$
D) $D = - 9$
E) $D = 1$