If， after doing many conditioning trials， a researcher presents the conditioned stimulus but DOES NOT follow it with the unconditioned stimulus， the research is likely examining（）.

If， after doing many conditioning trials， a researcher presents the conditioned stimulus but DOES NOT follow it with the unconditioned stimulus， the research is likely examining（）.
A.extinction
B.counter-conditioning
C.unlearning
D.spontaneous recovery
正确答案：extinction