The main factor slowed construction of the central pacific railroad was

The main factor that slowed construction of the Central Pacific railroad was. a shortage of supplies, which had to be shipped around South America. intense summer heat that melted the railroad ties and tracks.

Explanation:

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.  

the use of email to replace slower surface mail.