I Find That There Is a

I find that there is a +.59 correlation between shoe size and intelligence. What can I correctly conclude?

A) Having a bigger shoe size causes you to be more intelligent.
B) Being more intelligent causes you to have bigger feet and, thus, a bigger shoe size.
C) Exercise stimulates both physical growth (resulting in bigger feet) and intellectual growth (resulting in higher intelligence levels) .
D) Shoe size and intelligence are related but I cannot make a conclusion about cause and effect.