Ezra planted 10 plants and the depth of each plant (in inches) is shown below.

3 1/2, 4 1/4, 2 7/8, 3 1/2, 2 1/4 , 1 7/8 , 2 7/8, 2 1/4, 4 1/4, 3 3/8

What is the average depth of the plants?

A. 3 inches
B. 3 1/4 inches
C. 3 1/8 inches
D. 3 1/10 inches