Operant conditioning is a learning process in which subjects learn to associate
a.
their own behaviors with specific consequences
b.
unconditioned responses with conditioned stimuli
c.
the actions of others with their own responses
d.
unconditioned stimuli with conditioned responses

I think, correct me if I am wrong, it's A: their own behaviors with specific consequences

The correct answer is option A.

Explanation:

Operant conditioning refers to a procedure of learning, which takes place via punishment and rewards for specific behavior. With the help of operant conditioning, a person develops an association between a specific behavior and an outcome.  

This method of learning functions best via the punishment and rewards of a particular behavior. The main principle of learning in operant conditioning are the negative and positive reinforcement and negative and positive punishment.