A primary consumer would most likely feed on a) grass b) cows c)fish d) carrion

B

Explanation:

A primary consumer feeds off a producer. Grass simply can't eat another producer, they use photosynthesis to get there food. Fish often eat other type of fish or small sea creatures to get food. A carrion is a decomposer who gets there food through dead animals. So therefore cows would be the best answer.

the awnser is d i think