Context: Below is a food web from an ocean ecosystem in Monterey Bay, off the coast of California.
A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem.
Which of the following organisms is the omnivore in this food web?
A. black rockfish
B. zooplankton
C. kelp bass
D. orca
From the given choices, choose the correct answer and respond with the letter of that choice.

C