The correct option is C Green sulphur bacteria
Eukaryotic plants (Cycas, a gymnosperm and Chara, a green alga) and cyanobacteria (Nostoc) carry out oxygenic photosynthesis producing oxygen as a byproduct. They use water as the hydrogen donor.
Green sulphur bacteria carry out anoxygenic photosynthesis, which does not produce oxygen. They use hydrogen sulphide as the hydrogen donor.