The correct option is D Rhodophyceae
Floridean starch is storage material of red algae and is structurally similar to amylopectin and glycogen.
Chlorophyceae stores food in the form of starch whereas phaeophyceae stores food in the form of laminarin or mannitol. Cyanophyceae (blue green algae) stores food in the form of starch, protein as well as oil droplets.