How did the Indus river have an effect on the Indus river valley civilization

By 1800 BCE, the Indus Valley climate grew cooler and drier, and a tectonic event may have diverted the Ghaggar Hakra river system toward the Ganges Plain. The Harappans may have migrated toward the Ganges basin in the east, where they established villages and isolated farms.

i believe your answer is d)

the french revolution was when many people were persecuted for disagreeing or making separate government