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 these organisms contains matter that was once part of the bilberry?
A. lichen
B. bear sedge
C. barren-ground caribou
D. parasitic jaeger
From the given choices, select the correct answer and reply with the letter of the chosen option.

D