I'm taking a stab at it and say the last one. sorry if I'm wrong! XD
Answer:Many scholars believe that the collapse of the Indus Valley Civilization was caused by climate change. Some experts believe the drying of the Saraswati River, which began around 1900 BCE, was the main cause for climate change, while others conclude that a great flood struck the area.
Explanation:
I've had this question before.
He spoke about C. Colossal military disaster
It was on <span>January 1, 1863 </span>