Sociobiology is an interdisciplinary field which focus on the social behaviors in animals and human beings can be explained by evolution progress. This progress helped us to raise the tendency to act in ways that maximize the chances of passing on our genes and help their close biological relatives. To explain the human behavior we must take into account the cultural variable as well as the biological ones. So, the correct answer might be B “People with certain characteristics have been more likely to survive than people with different characteristics”.