The student is likely engaging or forming a hypothesis in which a hypothesis is a scientific method of having to formulate an intelligent or educated guess that may be an answer as to how a problem has occurred in which the student thinks that the racoon may live longer if it only eats vegetables.
This is an example le of commensalism.The burdock seeds benefit and the cow is unharmed.
Nonpoint source so your answer would be B.
This might help:
https://quizlet.com/1965478/environmental-health-test-1-flash-cards/
Plants get their energy from the sun using Photosynthesis and animals get it from eating food.