Final answer:
The statement 'Association is only acquired if the probability of US given CS is greater than the probability of US given no CS' reflects the Rule of Substitution.
Step-by-step explanation:
The statement 'Association is only acquired if the probability of US given CS is greater than the probability of US given no CS' reflects the Rule of Substitution.
The Rule of Substitution states that if two events have the same probability of occurring given another event, then they can substitute for each other in calculating probabilities. In this case, the statement is saying that the probability of the unconditioned stimulus (US) occurring given the conditioned stimulus (CS) is greater than the probability of the US occurring given no CS, which indicates a strong association between the CS and the US.