A social group into which a Hindu person is bot is called a

caste

Explanation:

this is what I was told in history but not sure if this is the answer your teacher needs

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.  

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.