Find and Simplify the Difference Quotient $$\frac { f ( x + h ) - f ( x ) } { h } , h \neq 0$$

Multiple Choice

Find and simplify the difference quotient $$\frac { f ( x + h ) - f ( x ) } { h } , h \neq 0$$ for the given function.
- $$f ( x ) = 3 x ^ { 2 }$$

A) $\frac { 3 \left( 2 x ^ { 2 } + 2 x h + h ^ { 2 } \right) } { h }$
B) $3 ( 2 x + h )$
C) 3
D) $\frac { 6 } { h } + x + 3 h$