Final answer:
A concurrent schedule involves two (or more) schedules of reinforcement in which completion of the requirements of one schedule is reinforced according to the requirements of the other schedule.
The answer is option ⇒D
Step-by-step explanation:
In operant conditioning, a concurrent schedule involves two (or more) schedules of reinforcement in which completion of the requirements of one schedule is reinforced according to the requirements of the other schedule.
For example, in a study, participants may be given the opportunity to earn points either by solving math problems or by reading a book. Each time they complete a math problem, they earn a point, and each time they read a book, they also earn a point. This is an example of a concurrent schedule of reinforcement.
The answer is option ⇒D