The correct option is C Methylmercury
Minamata disease was first discovered in Minamata city in Japan, in 1956. It was caused by the release of methylmercury in the industrial wastewater from the Chisso Corporation's chemical factory, which continued from 1932 to 1968. This highly toxic chemical bioaccumulated in shellfish and fish in Minamata Bay and the Shiranui Sea, which, when eaten by the local population, resulted in mercury poisoning. Cat, dog, pig, and human deaths continued for 36 years.