A medical student is attempting to understand the buffering system of the human body and has set up the following experiment in the lab to help with his understanding. Consider a biochemical reaction that is taking place in a 0.1 M buffer. The initial pH is 7.4, and the pKa of the buffer is 7.2. If, in a final reaction volume of 1.0 mL, 10 mol of protons are generated, what would be the final pH of the solution?

A. 7.59

B. 7.25

C. 7.22

D. 7.20

E. 7.15

Please show all steps.