Let $\int_{0}^{8} f(x) d x=C$ If F(x)is Even, What Is $\int_{-8}^{8} f(x) d x$

Multiple Choice

Let $\int_{0}^{8} f(x) d x=C$ .If f(x) is even, what is $\int_{-8}^{8} f(x) d x$ ?

A) $C$
B) $8 C$
C) $16 C$
D) $2 C$
E) 0