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.
Which of the following organisms is the producer in this food web?
A. pine vole
B. bolete fungus
C. persimmon tree
D. gray fox
Determine the correct option from the provided choices and reply with its corresponding letter.

C