Fact 1: Rivers are usually larger than streams.

Fact 2: Mountain stream water is drinkable.

Given the two facts above, answer the question "Rivers are usually larger than what" with the following options: 
- objects that have mass
 - body water
 - colder and wetter
 - Veins and arteries.
 - allow growth
 - loose soil
 - at or near the margins
 - mountain sources


 

        mountain sources 