According to an Evolutionary Psychology or Sociobiology Perspective,why Would Women

According to an evolutionary psychology or sociobiology perspective,why would women be more invested in ensuring the survival of their children than men would be?

A) because women are biologically incapable of being concerned about only themselves
B) because when a woman gets pregnant, a part of her brain is activated that ensures altruism
C) because most women can only have 20 to 30 children, while men can have thousands
D) because women have a gene that triggers nurturing behaviour as soon as a pregnancy occurs