Question: A factory in Japan had been dumping mercury into Minamata Bay. Certain microorganisms in the water were able to change the mercury into a form that the plankton could use. Which most likely happened next?

  Options: 
 A. The organisms built up a resistance to the mercury.
 B. The mercury passed through the food chain.
 C. The plankton made the mercury safe.
 D. The fish would not eat the plankton.
Answer: B