John and darrin always welcomed lee when he sat with them during luch. one day john and darrin ignored lee when he sat down because they were having an important conversation. from then on john and darrin ignored lee with he sat with them. eventually lee stopped sitting with them. what behavioral proceeded accounts for lees changed behavior?

Extinction

Explanation:

Extinction is a recognized behavioral phenomenon capable of making a person to gradually adapt to a continuously changing environment. When a learned behavior begins to decrease in strength when there is no reinforcement. From the question, we can see that John and Darrin did not reinforce the behavior of welcoming Lee and thus gradually Lee began to adapt to a changing environment and reacted according to the situation by avoiding John and Darrin.

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the answer your looking for is c. : )