Context: Below is a food web from a tundra ecosystem in Nunavut, a territory in Northern Canada.
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. barren-ground caribou
B. parasitic jaeger
C. rough-legged hawk
Select the correct answer from the provided options and reply with the letter associated with it.

A