What do you think the notation f(4.47) = 18 represents in terms of the red oak tree?

A
4.47 times the diameter of the red oak tree gives the age of the tree (18 years old).

B
18 times the diameter of the red oak tree gives the age of the tree (4.47 years old).

C
When the diameter of the red oak tree is 18 inches, the tree is 4.47 years old.

D
When the diameter of the red oak tree is 4.47 inches, the tree is 18 years old.