Question

Which additional word in the sentence should be capitalized?

Answer 1

A is the answer because you should always address a Doctor with a capital D not a lower case d. 

This is how I remember it if doctors help us when we are sick then we should not give him ick. Ick is a word I think means for me no respect.
Good Luck!

Answer 2

I think it is doctor if i am not right i am so sorry