Early civilizations used plants as medicine.
Answer:
"stress is not necessarily negative"
"the springboard for achieving more"
"stress motivates, energizes, and inspires"
"stress. ends up an unpleasant event"
Explanation:
The central idea of the passage is that, despite its bad reputation, stress can have both positive and negative effects.
The parts of the text that sustain that idea claim that, although it can be disturbing, stress can also lend impetus to greater achievements, because it stimulates action, as well as it provides higher energy and inspiration.
The answer is B. Just because its FDA doesn't mean there are no risks. Rather in the FDA tests, the human subjects generally didn't have much risk. But everyone is different and there are always risks.