Elton always wanted to play golf but he lacked the confidence. one day, he pushes himself, pulls out his clubs, heads for the golf course, and plays a decent round. for the next few days, he makes the effort and goes out golfing several times and is satisfied with his improvement. elton's behavior is increasing in frequency because of what lewinsohn calls

Response-contingent positive reinforcement

Response-contingent positive reinforcement  abbreviated as (RCPR), is referred to as  pleasure obtained through interaction with the environment  which consequently  increases the likelihood of participating in the rewarding behavior.

I Believe the answer is: Contingent positive reinforcement
Lewinsohn stated that Contingent positive reinforcement refers to the type of pleasures that are obtained through the interaction with our environment. This interaction become a trigger for individuals to keep seeking rewarding behavior, which caused them to pursue a certain activities that become the source of that reward ( in this case, the activity is golfing)