Correct Answer: (c) Warm and cold oceanic currents meet
Solution:At about 40° N and 60° S latitudes on the eastern margins of the continents, the cold and warm Ocean currents converge. On the contrary, at the same latitude, along the western coast of the continents, the cold currents flowing from the polar seas and the warm currents from the low latitudes meet with each other. Thus, there is a strong mixing of ocean waters. In such areas, the nutrients essential for marine organisms are in abundance. So, the marine life is rich in such areas. The most important fishing grounds in the world are located in shallow water close to the land where there is a mixing of Cold and Warm Currents from different regions. The favorable conditions for fishing are plankton concentrations, warm and cold Oceanic currents joints, the depth of water, its salinity & shallow sea etc.