The question asks for the explanation of the Premack Principle. Let's analyze the options one by one to determine the correct explanation.

• Option A: "A primary reinforcement is thought of being related to an organism's survival."
  • This statement describes the idea of primary reinforcement, which refers to stimuli that satisfy basic biological needs. This is not related to the Premack Principle.
• Option B: "A secondary reinforcer acquires reinforcing value because of pairing with primary reinforcer."
  • This refers to secondary reinforcement, where the value of the reinforcer is acquired through association with primary reinforcers. This does not relate to the Premack Principle either.
• Option C: "All responses are potential reinforcers."
  • This statement is broader and implies that any behavior could potentially be a reinforcer, but it does not specifically describe the Premack Principle.
• Option D: "More frequently occurring activity can be used to reinforce the activity that occurs less often."
  • This option correctly describes the Premack Principle, which suggests that an activity that occurs more frequently can be used to reinforce a less frequent activity. This principle is used in behavioral psychology to increase the probability of a less frequent behavior by using a more preferred activity as a reward.

Based on the analysis, Option D is the correct explanation of the Premack Principle, as it aligns with the idea that activities themselves can become reinforcers depending on their frequency and the preference of the individual.