Fact 1: Lakes are formed by precipitation and runoff.

Fact 2: For example, Lake Tahoe is a huge lake originating from mountain stream runoff.

Given the two facts above, answer the question "What does Lake Tahoe originate from?" with the following options: 
- hydrogen and oxygen
 - It's manmade
 - An ocean
 - tectonic plates coliding
 - A hurricane
 - A mountain stream
 - Water expanding
 - body water


 

      A mountain stream   