Answer:
number
Explanation:
the definitions for quantity are "The amount or number of a material or immaterial thing not usually estimated by spatial measurement. The perceived length of a vowel sound or syllable."
The word you're looking for is prowess, however you didn't post a list. Prowess means superior skill, strength, or ability. Other similar words are expertise, aptitude, and mastery.
Your answer is B. the greeks and trojans
The righty answer is D, at the beginning the narrator mentions how enthusiastic they are about the study of anatomy and paid lip service to the mismatch in time and the perception of it. At the end, as death is inevitable, the narrator urgers the reader to enjoy their lives, because it will eventually come to an end.