An absorption spectrum of chlorophylls have:

Explanation

Option B is correct.An absorption spectrum of chlorophylls has two peaks and one valley. The peaks are located at wavelengths of 430-470 nm (blue-green) and 660-670 nm (red). The valley is located at a wavelength of 520-530 nm (green). The peaks in the absorption spectrum of chlorophylls correspond to the wavelengths of light that are absorbed most strongly by chlorophyll. The valley corresponds to the wavelength of light that is absorbed least strongly by chlorophyll. The absorption spectrum of chlorophyll is important because it shows the wavelengths of light that are most useful for photosynthesis. The blue-green and red parts of the spectrum correspond to the wavelengths of light that are most useful for photosynthesis, so chlorophyll is able to absorb these wavelengths of light very well.