The correct option is D All the above
The members of Rhodophyceae are called red algae because of the predominance of r-phycoerythrin in their bodies. They have a very complicated body organization. In red algae, the food is deposited as floridean starch, which is very similar to amylopectin and glycogen in structure. The red algae usually reproduce vegetatively by fragmentation. They reproduce asexually by non-motile spores and sexually by non-motile gametes.