Which of the following are reasons for the chief fishing grounds being located in continental shelf areas where cold and warm currents meet?I. Warm currents are rich in phosphates and nitratesII. Plankton - the chief fish feed - thrives in these regionsIII. The meeting of cold and warm currents allows the water to be well aeratedIV. The epicontinental seas allow sunlight to reach almost to the bottom

• A. I and III
• B. II and IV
• C. I, II and III
• D. II, III and IV