In general, where groups remain culturally or physically distinct, mobility between ethnic strata is:
a. enhanced.
b. limited.
c. neutral.
d. destroyed

b. limited.

Explanation:

Ethnicity refers to the social groups who share the same culture or nation. Social groups who remained culturally distinct develops stereotypes about the other groups belonging to different ethnicity. These stereotypes segregate the social groups on an ethnic basis and therefore the movement among different strata becomes limited.

it should be c, women were allowed to vote in all states because federal law supersedes state law.

"states can make their own laws, as long as they don't contradict what the federal law states. the states do not have the authority to pass a law that negates a federal law." -google

i think it is the third one.