The information of an energy pyramid reveals that for human food choices,

a. it is more expensive and less efficient to get most of your dietary calories from grains.
b. consumers at lower trophic levels do not have as much energy and biomass as consumers at higher trophic levels.
c. consumers at higher trophic levels are usually more abundant than consumers at lower trophic levels.
d. it is more expensive and less efficient to get most of your dietary calories from meats.