All of the following are economic spin-offs caused by the invention of the automobile EXCEPT:?

Question:
A. gas stations
B. vulcanized rubber
C.road construction
D.mass-transit systems

Answers:

B. vulcanized rubber was invented by Charles Goodyear in the first half of the 19th century. no cars then.

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vulcanized rubber
originally made for fire hoses

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only a is a result of cars
the rest are not economic spin offs though A&B are all greatly increased in use beaucse of the use by cars
b because it was/is used for many other products
c- because roads are needed whether there are cars or not adn hve been aroudn for tousands of years
d. Mass transit was already in operation befroe the car was invtented.

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All of the following are economic spin-offs caused by the invention of the automobile EXCEPT:?

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