An organism of kingdom plantae grows in marine waters. It is having laminarin as reserve food materials and its zoospores have two unequal flagella on the lateral side. Its frond is dichotomously branched and shows oogamy during sexual reproduction. The organism is identified as  

• A

  Porphyra

• B

  Polysiphonia 

• C

  Dictyota 

• D

  Ectocarpus