The correct answer is (d). Dogger Bank is a large, shallow submarine sandbank in the North Sea, between England and Norway. It is one of the most important fishing grounds in the world.
(a) Danish Bank is a submarine bank in the North Sea, east of the Shetland Islands. It is not a major fishing ground.
(b) Scandinavian Bank is a submarine bank in the North Sea, west of Norway. It is not a major fishing ground.
(c) Grand Bank is a submarine bank in the Atlantic Ocean, off the coast of Newfoundland. It is one of the most important fishing grounds in the world, but it is not located in the North Sea.