The Sun's Energy Output Is a Maximum in the Visible

The sun's energy output is a maximum in the visible region of the spectrum. One biological reason we might expect or predict this fact is that

A) the visible region has the highest frequency.
B) the visible region comes right in the middle of the overall electromagnetic spectrum.
C) it would be impossible for biological photosynthesis to occur if any other region dominated the solar spectrum, and thus plant life could not exist on Earth.
D) the human eye would be expected to evolve in such a way as to make use of the sun's main energy output.
E) visible radiation is the only type of solar radiation with enough energy to actually burn our skin.