What was the purpose of the first earth day event on April 22, 1970

The purpose of the first earth day event on April 22nd of 1970 was to spread awareness to the public about environmental problems around the world.

Explanation:

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the qing dynasty placed strict limits on foreign merchants' ability to trade in china.

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.