Find the Key Numbers of the Expression $16 x ^ { 3 } - 49 x ^ { 2 }$

Multiple Choice

Find the key numbers of the expression.
$16 x ^ { 3 } - 49 x ^ { 2 }$

A) 0, $\frac { 16 } { 49 }$
B) 0, 49
C) 0, 51
D) 0, -49
E) 0, $\frac { 49 } { 16 }$