Context: Below is a food web from Shenandoah National Park, a forest ecosystem in Virginia.
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.
In this food web, which organism contains matter that eventually moves to the parasol fungus?
A. gray fox
B. swallowtail caterpillar
C. black racer
D. bobcat
Pick the correct answer from the listed options and provide the letter of the selected option.

B