Personally, I see it as a mixture of both a and b but my first instinct was to go with b.
Answer: Through war, the Aztec Empire gained tribute from conquered enemies. People captured during war became slaves or sacrifices in the Aztec's religious ceremonies. Expanding the empire through further conquests strengthened the empire and brought more riches in tribute.
Explanation:
Serotonine would be the answer
Metaphorically, the part of sociology that a zoom lens on a camera would be most like is microsociology.
Just like the lens on a camera is used to zoom in certain objects, places, or people, the same goes for microsociology - it zooms into sociology, exploring the minute details that would otherwise go unnoticed.