Within the plant's chloroplasts, there is a pigment called chlorophyll. Chlorophyll absorbs all wavelengths of white light except for the green wavelength, the pigment reflects this color and this is why it has a green color. The green color of the plants is given by the green color of this pigment.
The correct option is
"They contain the pigment chlorophyll which reflects green light, making the plants appear green. "
