To replace fossil fuels, the world must find a way of producing fuel from renewable energy. one of the most promising fuels of the future is hydrogen, which could potentially be produced in algae using the power of sunlight. green algae contain enzymes (hydrogenases) that can convert hydrogen ions (h+) and electrons to hydrogen gas (h2). the hydrogen ions used by the hydrogenase come from

a- atp synthase.

b- water.

c- organic sugars.

d- atp.

e- rubisco.