If the Plants in a Community Produce 500 Grams of Organic

If the plants in a community produce 500 grams of organic matter per square meter per year that is available for animals in the community to eat, this amount of energy is known as the

A) availability factor of the community.
B) trophic factor of the community.
C) net primary productivity of the community.
D) secondary productivity of the community.
E) consumership of the community.