Answer: (A) Fixed interval
Step-by-step explanation:
The fixed interval schedule is the type of schedule of the reinforcement in the operand conditioning in which the the initial response are rewarded by some specific amount of the time.
The main issue with the fixed interval schedule is that the people have to wait until the reinforcement schedule get occur and start their actual response of interval. This type of reinforcement schedule occur as the output value does not posses constant value all the time.
Therefore, Option (A) is correct.