The correct option is A oxidize
Photosynthesis uses two types of chlorophyll, chlorophyll a and b, to produce energy.
Chlorophyll A is the primary photosynthetic pigment. It absorbs energy from wavelengths of blue-violet and orange-red light at 675 nm.
Where as Chlorophyll B is the accessory pigment which absorbs energy from wavelengths of green light at 640 nm.
Chlorophyll b does not oxidize, whereas chlorophyll a does.