Final answer:
Wind-driven surface currents affect the upper 100 meters of the ocean's surface. The correct answer is A.
Step-by-step explanation:
The question you are asking relates to the mixing of ocean water due to wind-driven surface currents. These currents are capable of mixing the upper levels of the ocean and are a vital component of the ocean's overall circulation system. The correct answer to your question is a) 100 meters. Wind-driven surface currents typically affect up to the upper 100 meters of the ocean's surface, moving warm and cold water around, which impacts climate and marine life. This upper layer of the ocean is known as the mixed layer, and it is where a lot of the ocean's kinetic and thermal energy is stored and exchanged with the atmosphere.