Context: Below is a food web from Little Rock Lake, a freshwater lake ecosystem in Wisconsin.
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 primary consumer in this food web?
A. bacteria
B. rotifer
C. black crappie
Identify the correct option from the choices provided and respond with the letter of the correct option.

B