The belief that a woman’s place is in the home and not in the workforce is an example of a gender law. a workplace policy. a cultural attitude. a union regulation.

a cultural attitude

Explanation:

Nowadays in the US there's no such a thing as a law that forces women to stay home. They are as free as man and therefore they can do whatever they want, including staying home. The only reason that this belief still shows up is because of cultural reasons.