Prejudice is to discrimination as _ is to _.

• a. affect; behavior
• b. affect; cognition
• c. cognition; affect
• d. cognition; behavior

This is because  discrimination is the behavior or actions, usually negative, towards an individual or group of people, especially on the basis of sex/race/social class  and that prejudice includes all three components of an attitude (affective, behavioral and cognitive), whereas discrimination just involves behavior.