Which of the Following Accounts for in Susceptibility to Problems

Which of the following accounts for in susceptibility to problems in ?

A) The placentas of male fetuses are larger and better developed than those of female fetuses, which provides greater protection to males from negative external influences.
B) More female fetuses than male fetuses are spontaneously aborted; therefore, there are a greater number of male fetuses to be affected by negative influences during pregnancy.
C) Many more female fetuses than male fetuses are conceived, which means there's a greater likelihood that female fetuses will be susceptible to negative influences during pregnancy.
D) The placentas of female fetuses are larger and better developed than those of male fetuses, which provides greater protection to females from negative external influences.