Find the Limit Algebraically $$\lim _ { x \rightarrow } \left( 6 - 3 x ^ { 2 } \right)$$

Find the limit algebraically.
- $$\lim _ { x \rightarrow } \left( 6 - 3 x ^ { 2 } \right)$$

A) $- 48$
B) $- 237$
C) 249
D) $- 21$