Here's a problem to solve: Which fact best explains why most evaporation happens in the oceans?

Among the 4 following options, which is the correct answer?

- A: Ocean water is salty.
 
- B: There are mountain ranges on the ocean floor.
 
- C: About 97 percent of Earth's water is ocean water.
 
- D: Fewer clouds block sunlight over the ocean.
 