The correct option is B 150-200m - Red algae; 100-150m - Brown algae; 50-100m - Green algae
Green algae possess the pigment chlorophyll, which mainly absorbs blue and red light, and themselves, appear green. Brown algae contain the pigment fucoxanthin, which absorbs blue-green and yellow-green lights and appear brown. Red algae contain phycobilins, which primarily absorb blue light and appear red. Thus, red algae are found deepest, green algae at the uppermost layers, and brown algae intermediate between these.