Here's a problem to solve: The radiant energy that comes to Earth from the Sun is

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

- A: only one wavelength that we see as yellow.
 
- B: a narrow band of wavelengths that is entirely visible light.
 
- C: mostly long wavelengths that become heat energy.
 
- D: a range of many wavelengths from long to very short.
 