In a study based on tajfel’s theory of social identity, cathy is randomly assigned to group a, and sara is randomly assigned to group b. when asked to award money to other study participants, both cathy and sara award money only to members of their own groups.
this behavior is predicted by tajfel’s theory and best exemplifies

in-group Favoritism                                        

Explanation:

In-group favoritism: The term in-group favoritism is also called as intergroup bias, in-group–out-group bias, in-group bias, or in-group preference.

In-group favoritism is defined as a phenomenon of an individual favoring the members of his or her group i.e, the in-group over the members of another group i.e, the out-group. In-group favoritism can be expressed in terms of allocation of resources, other's evaluation, and in various other ways.

The in-group favoritism leads to develop a powerful influence on the group as well as the individual's behavior.

In the question above, the statement signifies the in-group favoritism.

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