Is an unjustified negative attitude toward an individual based on the individual's membership in a group while is an unjustified negative or harmful action toward a member of a group simply because the person belongs to that group.

The answer is Prejudice; Discrimination
Example of prejudice, not taking someone's work seriously because that employee is a woman.
Example of discrimination, purposefully not admitting someone to a certain job position solely because that person belongs to a minority group.

The answer should be a.