Answer:
VI
Explanation:
The reinforcement schedules are of four types:
1. Fixed ratio schedule.
2. Fixed interval schedule.
3. Variable ratio schedule.
4. Variable interval schedule.
Variable interval schedule or VI: This is one of the reinforcement schedules in operant conditioning in which a response gets reinforcement after a specific and unpredictable time and the time is changing.
In the question above, the pigeon is most likely on a variable interval schedule of reinforcement.