Final answer:
Non-contingent reinforcement is the term used to describe the reinforcement of any behavior other than a target behavior that is being extinguished in operant conditioning.
Step-by-step explanation:
In operant conditioning, the reinforcement of any behavior other than a target behavior that is being extinguished is called d) Non-contingent reinforcement. Non-contingent reinforcement involves providing reinforcement for a behavior regardless of whether the behavior is being exhibited or not. It does not depend on the occurrence or non-occurrence of the target behavior being extinguished.