The automobile industry's success came through the following:

2. A mass production assembly line.

3. Television advertising

4. Making the same models of car year after year.

5. Making cars more expensive.

A. A mass production assembly line.

Explanation:

By having an assembly line, the production of cars became much more efficient, since the work was split up between workers and moved from person to person

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.