Harappan civilization forms an important landmark in the prehistory of the Indian subcontinent. The civilization offers an excellent example to the modern world in various ways. Their expertise in town planning, water management and harvesting systems as well as drainage mechanism is unparalleled.
Over 100,000 Allied bomber crewmen were killed over Europe. More US servicemen died in the Air Corps that the Marine Corps. In World War II, British soldiers got a ration of three sheets of toilet paper a day. Americans got 22. Only 20% of the males born in the Soviet Union in 1923 survived the war.
I think it would be the third choice