Read the following context and choose the best option to answer the question.
Context: Then he wrapped my hands , put the gloves on me and brought me over to the heavy bag . He 'd call out strings of punches like , " 2 , 3 , 2 , 4 ! " and I 'd have to hit the bag with the corresponding punches that I just learned . That part was fun .
Question: What does " he " do for work ?
Options: 
A. None of the above choices .
B. He makes heavy bags .
C. He calls out strings of punches .
D. He is a personal trainer .


D