If C died off then it would affect B greatly because it is its only source of food therefore C is the answer.
What is Food web?
In an ecosystem, consumers are heterotrophic organisms that can not make their own food. They rather depend on producers or other consumers for food and nutrition. The organisms that derive their nutrition directly from plants are called primary consumers.
They are also called herbivores as they feed on plant and plant products. For example, deer graze grasses. This makes deer a primary consumer and a herbivore.
Thus, they inter dependent on C on each other.
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