Which of the statements about typical prenatal development is correct?

a. Female and male embryos are very similar during the first weeks of prenatal development.
b. Shortly after conception, the genitals of females and males look different.
c. Male and female genitals develop at about 6–12 weeks after conception, and the two types of genitals are formed out of very different embryological structures.
d. Male genitals develop at about 4 weeks after conception. Female genitals develop at about 12 weeks after conception.

A