(C) is the right answer.
The members of phaeophyceae or brown algae possess chlorophyll a, c, carotenoids and xanthophylls. Food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol. The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin. The protoplast contains, in addition to plastids, a centrally located vacuole and nucleus.