Based on the passage, what roles did the Himalayas and the Hindu Kush Mountains play when it came to outsiders entering the Indian subcontinent?

i believe its the indians

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

its b wells tried to fight lynching in the south by

c. businesses/firms & government