A study found that whereas elderly consumers were willing to pay $60 for a phone plan from T-mobile but $40 for an equivalent plan from AT&T, younger consumers were willing to pay $50 for both plans. The pattern suggests

A. Phone plans, on the average, are more attractive to the elderly relative to the younger consumers B. Consumers, on the average, are willing to pay more for the AT&T than for the T-Mobile plan C. There is a crossover interaction D. All of the listed options are correct