Answer:
Saying "Match blue" and receiving a blue card
Explanation:
A discriminative stimulus is a stimulus like a place, people or thing which causes a forced behavior of reinforced behavior. This reinforced behavior is not necessarily observed in stimulus behavior.
In the given question, the person wanted the match for blue color (stimulus) and received a blue card (reinforcer). In this situation since the person wanted the match for the blue color and received it as well, therefore, a reinforced behavior is expected in the case as the person got what he wanted.
Thus, Saying "Match blue" and receiving a blue card is correct.
