What range of the electromagnetic spectrum is considered as visible light?

• A
  $1 \text{ mm}$ to $700 \text{ nm}$
• B
  $400 \text{ nm}$ to $1 \text{ nm}$
• C
  $400 \text{ nm}$ to $700 \text{ nm}$
• D
  $1 \text{ nm}$ to $10^{-3} \text{ nm}$