what organisms would you use to create a self-sustaining ecosystem? BUT i need to have a claim, evidence, reasoning

plato users

given bodies of water

pacific / arctic / indian / southern

[ a ] the caribbean sea

[ b ] the northern ocean

[ c ] the atlantic ocean

[ d ] the barents sea

with this being the given answers

i think the answer is b.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.