Dysfluency or post-reinforcement pauses may occur when a student is on a schedule of reinforcement.

Dysfluency or post-reinforcement pauses may occur when a student is on a FI and FR schedule of reinforcement. FR schedule stands for Fixed-ratio schedule, which describes when behavior is reinforced when it has occurred a fixed number of times.
Most common this pauses occur from fatigue or are a way of escaping the aversive aspects of the schedule.
The situation in which we take a "break" before setting to work is an example of post-reinforcement pause.

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The correct answer is "  it was believed that the dispute emerged in 632 just after the death of the prophet muhammad."