Find $\lim _{h \rightarrow 0} \frac{f(x+h)-f(x)}{h}$ For $f(x)=4-6 x$

Multiple Choice

Find $\lim _{h \rightarrow 0} \frac{f(x+h) -f(x) }{h}$ for $f(x) =4-6 x$ .

A) 6
B) 10
C) -6
D) 4
E) limit does not exist