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When a child gets two chocolates once every week for its performance in the class it is an instance of

  • A.Fixed ratio, variable interval
  • B.Fixed ratio, fixed interval
  • C.Variable ratio, fixed interval
  • D.Variable ratio, variable interval

Answer: B

The schedule is fixed ratio and fixed interval.

The key reads the two chocolates as a fixed amount of reward, a fixed ratio, and the arrival once every week as a fixed interval. The reward comes at the end of a regular period and does not vary.

Variable schedules give the reward unpredictably, in number or in timing, and nothing in the question is random, so the options with variable are wrong.

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