Which sentence contains the best example of precise language?

a he is interested in a lot of things.
b salted peanuts are high in protein.
c she is a nice person.
d playing games is fun.

Collections grade 10 guiding questions collection 6 "letter from birmingham jail" by martin luther king jr lines 66-101 why might king have taken the time so early in the letter to delve into such minute details about steps taken and recent event in birmingham?

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)

I’m cruel tribute which characters action most advance the development of the plot?