What Factor Could Potentially Increase the Length of a Food

Multiple Choice

What factor could potentially increase the length of a food chain?

A) having a single species of herbivore feeding on each plant species
B) increased extinction rates of species in the food chain
C) decrease in the amount of energy in a trophic level that is lost as it passes to the next higher level
D) increase in the amount of energy in a trophic level that is lost as it passes to the next higher level