After Reading the Paragraph Below, Answer the Questions That Follow

Multiple Choice

After reading the paragraph below, answer the questions that follow.
Consider the following marine community: Sea otters prey on sea urchins and therefore help maintain a healthy sea urchin population. Sea urchins prey on kelp. By helping to maintain viable sea urchin populations, the sea otters are also allowing enough kelp to grow and act as a habitat for other organisms.
-In this marine community, the sea otter is

A) a primary consumer.
B) a producer.
C) a keystone species.
D) a scavenger.