Evaluate Each Expression When X = 6, Y = 2 $-x^2 - 4xy^2 + 3xz^2$

Evaluate each expression when x = 6, y = 2, and z = -4.
- $-x^2 - 4xy^2 + 3xz^2$

A) -348
B) -420
C) 228
D) 156