Answer:
Correct answer is d. Less than 1,400
Explanation:
I am choosing option D because according to historians there were around thousand cities in the Indus Valley.
The number that is usually mentioned in the sources in 1052, therefore I choose the last option.
d. it took place in confederate territory
It enabled Europeans to buy Chinese tea, silk, and porcelain
Monsoons can cause many different problems but perhaps the most devastating are the floods that can take up an entire city which leads to isolation and sickness.