Answer:
Seaweed is apart of the kingdom B, Protista
Explanation:
This is because seaweed is an algae, which is a multicellular photosynthetic protist.
Kingdom Protista is a unique group that dont belong in the plant, animal or fungi kingdoms. Many are unicellular organisms as well, but some different algae forms can be multicellular
Hope this helps! Have a good rest of your day!!
