When the XY genetic code begins to assert itself

Question

A ovaries begin to differentiate
B testes begin to differentiate
C estrogen begins to be produced
D brain development begins to occur more rapidly

i believe the correct answer is B

Answer 1

It turns out brain development in the male is turned on before testes are differentiated, there are a number of studies on male/female development differences. However, I am not certain the male brain develops more rapidly, it just develops differently. Given that, B is the best answer. IMO, trick question.