a. Rhodophyceae

b. Chlorophyceae

c. Phaeophyceae

d. All of the above

A)Correct option – C

B) Explanation of correct option –

●Phaeophyceae is a brown algae.

●Phaeophyceae is a large group of multicellular algae, including many seaweeds .

● Most brown algae live in marine environments, where they play an important role both as food and as a potential habitat.