Electromagnetic spectrum — practice question

Which wavelength of electromagnetic radiation in free space could correspond to green light?

• A$4.9 \times 10^{-9}\,\text{m}$
• B$6.6 \times 10^{-9}\,\text{m}$
• C$5.5 \times 10^{-7}\,\text{m}$
• D$8.6 \times 10^{-7}\,\text{m}$