Photosynthesis is a process in which plants use light to obtain energy. This process occurs in an organelle called chlorophyll. This organelle presents a green color because green is the only light that's not absorbed, so it is reflected and we see it. Therefore, all other lights provides energy because they are absorbed, except for the green light that is reflected. As green light is not absorbed, it is not used to obtain energy, but the other lights do. So, the light that does not provide energy for photosynthesis is B. green.