Final answer:
A rational-emotive behavior therapist is likely to challenge unrealistic ideas or beliefs of their clients, but they would not validate their anger.
Step-by-step explanation:
A rational-emotive behavior therapist is likely to use statements that challenge unrealistic ideas or beliefs of their clients. However, one statement that they would not likely use is d. "It is rational that you are angry at people who let you down." This statement validates the client's anger rather than challenging their unrealistic belief.