The answer is C.15, USSR broke into 15 republics including Russia itself.
I was excited to see this question because I, myself, just learned this the other day. The answer you are looking for is Tokyo.
I believe the answer is number 2: Natural Harbors. The Industrial Revolution found success in Britain/England due to it's harbors and ports. I'm not sure how the weather and geographical conditions would have a major impact on the Industrial Revolution.
Answer:
The resistance of the air would be your answer.
Explanation:
It acts like same as Friction.
Hope it helps!
The correct answer is 135 years.