Which of the following is not true about the development of railroads in the first half of the nineteenth century? a. the rocket inspired american inventors to turn their attention to railroads. b. railroad companies could never agree to use the same gauge - the space between the rails. c. americans even began talking of building a railroad all the way to the pacific ocean. d. railroad companies eventually replaced wooden railroad tracks with ones made of iron.

I'm pretty sure it's D. Railroad companies eventually replaced wooden railroad tracks with ones made of iron.

d

Explanation:

b.   jim crow laws were enacted in northern states.

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.