convergent/divergent integrals

Suppose f and g are continous functions with f(x) g(x) 0 for x a then

(A) If integral a to infinity f(x) dx is convergent, then integral a to infinity g(x) dx is convergent

(B) If integral a to infinity f(x) dx is divergent, then integral a to infinity g(x) dx is divergent

(C) If integral a to infinity f(x) dx is convergent, then integral a to infinity g(x) dx is divergent

(D) If integral a to infinity f(x) dx is divergent, then integral a to infinity g(x) dx is convergent

i have no idea on this one..(Thinking)