Right option is (d) 400 million yen
To elaborate: In 1973, the Minamata Fisheries Co-op received 4 hundred million yen from Chisso as compensation to the fishing industry and 2.28 billion was also paid to the 30 fishing cooperatives of the Shiranui Seaboard, and 729.6 million to the three fishing cooperatives of Izumi City, Azuma Town, and Nagashima Town.