The answer to your question is D
The answer is C. Producers make food which os then consumed then decomposers eat the remains.
Carrying capacity is the maximum amount of organisms a certain ecosystem can sustain with the resources available in a given ecosystem.
Factors that could either increase or decrease the K, carry capacity, would be: drastic weather causing depletion of resources, decreases in competition, etc.
I think it is 10% ......................