The answer is 4.
The reason why is because after world war 1, totalitarian governments were established and they were Germany, USSR, Japan, and Italy.
Answer:
If their writing dissapears, then, what is known about that civilization is also likely to dissapear, unless their previous writing was preserved in some other way.
This is something that has actually happened often in history. For example, the library of Alexandria, in Egypt, was the largest library of the Ancient World, and it was burned down by Caliph Omar in 642 AD. Countless works by Ancient authors, that gave account of civilizations, cultures, philosphies, and religions, were lost, and there is no plausible way to recover such knowledge in the current era.
The Salt March was in protest of: A. Britain’s requirement that India could only purchase salt from government sources.
At that time, the government sources provided the salt in an extremely high price, and almost all people in India experienced the economic burden since Indian cuisines are heavily reliant on salt and spices for their flavor. On top of that, the process to create salt was extremely easy and the high price could not justify it. (salt is made only by evaporating sea water)