Which of the Following Is True in the Context of the Evaluation

Which of the following is true in the context of the evaluation of prevention programs?

A) Statistical significance is more likely to occur when the effects of a prevention program are small and the number of units of analysis is small.
B) Statistical significance is less likely to occur when either the effects of a prevention program are small or the number of units of analysis is small.
C) According to the concept of marginal utility, the less the discrepancy between an actual (empirically verified) event and the minimum occurrence of the event, the less difficult it will be to change the event.
D) According to the concept of marginal utility, the more the discrepancy between an actual (empirically verified) event and the maximum occurrence of the event, the more difficult it will be to change the event.