Answer:
A. To inform readers about caffeine facts.
Step-by-step explanation:
The above paragraph mainly talks about the various facts about caffeine. He includes where caffeine is found, how it affects our bodies, how it helps in staying alert and how much of it is in a particular thing. But there is no mention of any personal stories, nor is there any request or advice for consuming this product. He also does not say anything about monitoring one's intake of caffeine. He only just mentions the simple known facts. So, the purpose of writing this paragraph is just to inform the readers about caffeine.