What are primary sources?

A primary source is an artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was created at the time under study

Primary sources are sources from an author who has direct, first-hand experience with a period or an event. Primary sources are written around the time the event they describe occurred.

Explanation:

A picture of soldiers in world war two would be a primary source because it was taken at the time of the war, and was not produced at a later date.

b

make me

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.