The answer to your quiestion is D. A course in Anatomy!
Explanation: So it would not be A because why do you need to learn about Chemistry for a Massage Therapist? And It is also not B because we don't need to learn about gravity to be a Massage Therapist! It is also not C because Who needs to learn about microbiology?
But the only explanation is that you need to learn about Anatomy so you can see the types of mussle and scar tissue! You also need to know where the pationts problem is and how to fix it!
Sorry, it took so long lol!