Answer:
The answer is A) gender roles.
Explanation:
Gender roles refer to a set of behaviours that is considered as appropriate for a certain gender. Gender roles vary among different cultures, although most of them are based on the notions of the masculine and femenine.
Gender roles have been shown to influence a person's social development and self-concept.
American war is War in American :|
Ivan pavlov introduced the concept of CONDITIONING when he taught a dog to salivate at the sound of tuning fork
The same condition happen to human. Our brain response to our exact habitual conditioning that's why sometimes it's very hard to lose/change a habit.
For example, if you condition yourself that you need to hold some sort of doll before you went to sleep, it will be hard for you to sleep if somehow that doll is not in your possession<span />