A. Warm air rises and F. Cooler air travels back to the ocean surface
A pronoun can substitute a noun or a noun phrase. Among the options above only C. him and D. They are pronouns: stories is a noun and many could be a pronoun if is was standing alone, but here it is a part of a noun phrase.
C. him is singular, so the right answer is D. They
a or c bc the other ones do nt make sence
Your answer to this will be the last sentence.
However, he deserves little credit, for since that time, still greater strides have been made in battlefield medicine.
I am 100% sure of this
