Here's a problem to solve: Why does a town in the desert rarely experience early morning fog as compared to a town along the coast?

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

- A: There is less rainfall in the desert.
 
- B: Temperatures vary more in the desert.
 
- C: There is less water vapor in the desert air.
 
- D: There are fewer plants in the desert.
 