I do believe the answer is b. introductions. why? well because an exposition is where everything is introduced. the characters, the setting, the time, etc.
Answer:
agriculture:
it grows crops, which keep you feeded, and watered.
back in like B.C. and B.C.E(same era of time, just different names) farmers could trade crops for building tools which would help expand their civilizations
provides dairy, meat, and food.
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I hope that this helps you :)
Chronological structure is most likely to feature these terms. Also, when explaining how to do something, these terms are commonly used.