The correct option is D all round the year
An American company called AquaBounty Technologies has created a genetically modified variant of salmon called AquAdvantage salmon. They fused a growth hormone regulating gene from a Pacific Chinook salmon with a promoter from an ocean pout and added the transgene to the Atlantic salmon’s 40,000 genes. This transgene allows the fish to achieve accelerated growth rates and enables the salmon to grow year-round instead of only during spring and summer.