The correct option is TWO LARGE RIVERS.
The Aral lake was once the fourth largest lake int the world. It was fed by two large rivers: Amu Darya and Syr Darya rivers. Some even called the Aral lake a sea because of its large size, but that was then, the lake has been drastically reduced in size now due to water diversion.
1- burning fuels by human that increase the amount of carbon dioxide on earth
2- volcano eruption
3- deforestation
hope this helps
good luck
