Sexual dimorphism's are

Question

a) observable physical differences within single gender (e.g. tall men vs short men.)

b) observable physical differences between the genders (e.g differences in mens and women's brains)

c) assumed differences in the capacities of the genders (e.g the belief that men drive better than women)

d) odd, abnormal, or deviant sexual behaviors (e.g voyeurism or exhibitionism)

Answer 1

http://en.wikipedia.org/wiki/Sexual_dimorphism

Answer 2

So is it B?

Answer 3

I don't think any of these answers is correct. Differences in male and female brains is not an observable difference.