In operant conditioning, is when something is removed to increase the likelihood of a behavior. a negative reinforcement b positive reinforcement c punishment d punishment reinforcement

I believe the answer is: negative reinforcement

For example, a child might feel anxious in his/her test because the parents would scolded them if the result does not meet their expectation.
In this context, the scolding act as a negative reinforcement and if it's removed, the child would most likely feel less anxious in the test.