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

Multiple Choice

Compute and simplify the difference quotient $$\frac { f ( x + h ) - f ( x ) } { h } , h \neq 0$$
- $$f ( x ) = 6 x ^ { 2 } + 5 x$$

A) $18 x - 8 h + 10$
B) $12 x + 5$
C) $12 x ^ { 2 } + 6 h + 5 x$
D) $12 x + 6 h + 5$