The assumption that a man would work to support his family while his wife would stay home to care for their children would be an example of

This is an example of gender role expectations. Gender roles are what we are expected to do or act in the society based on our sex.  It is somewhat a stereotype that is primarily based on a person’s gender. Gender roles may differ from one society to another.

no the answer is c only objects touching the earth's surface can be acted upon by an outside force