The bottom and largest level of the pyramid is the producers and contains the largest amount of energy. As you move up the pyramid, through the trophic levels to primary, secondary and tertiary consumers, the amount of energy decreases and the levels become smaller. Here, in the given trophic levels, A is producer, B is primary consumer, C is secondary consumer and D is tertiary consumer. Hence, we can say that A trophic level has the highest amount of energy.