Question

caffeine is a central nervous system (cns) stimulant of the methylxanthine class. it is the worlds most widely consumed psychoactive drug. unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. it is found in the seeds, nuts, or leaves of a number of plants native to south america and east asia and confers on them several survival and reproductive benefits. the most well - known source of caffeine is the coffee bean. beverages containing caffeine are ingested to relieve or prevent drowsiness and to improve performance. to make these drinks, caffeine is extracted by steeping the plant product in water, a process called infusion. caffeine - containing drinks, such as coffee, tea, and cola, are very popular; in 2005, 90% of north american adults consumed caffeine daily. the passage suggests that one effect of ingesting caffeine is
a the prevention of drowsiness.
b a decrease in hunger.
c an increase in depression.
d extreme anger.

Explanation:

The passage states that beverages containing caffeine are ingested to relieve or prevent drowsiness. There is no mention of a decrease in hunger, an increase in depression, or extreme anger related to caffeine ingestion.

Answer:

A. the prevention of drowsiness