Explanation:

• Option (c) is correct
• Ocean currents are like river flow in oceans.They represent a regular volume of water in a de-finite path and direction.Ocean currents are in fl uenced by two types of forces namely:
• (i) primary forces that initiate the movement of water;
• (ii) secondary forces that in fl uence the currents to flow.
• The primary forces that influence the currents are: (i) heating by solar energy; (ii) wind; (iii) gravity; (iv) coriolis force .
• Temperature difference, salinity difference and top