Evaluate the Function as Indicated $f(-r)$ When $f(x)=7-4 x$

Multiple Choice

Evaluate the function as indicated.
-Find $f(-r)$ when $f(x) =7-4 x$ .

A) $7+r x$
B) $r-4 x$
C) $7+4 \mathrm{r}$
D) $7-4 \mathrm{r}$