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The correct answer is option 3, subtropical high pressure. Trade winds are prevailing winds that blow from the subtropical high pressure zones towards the equator. These winds are typically easterly in nature, meaning they blow from east to west. The presence of high pressure in the subtropical regions creates a pressure gradient, causing air to move towards the equator. As the air moves closer to the equator and becomes warmer, it rises, resulting in the formation of a low pressure zone near the equator. This movement of air from the subtropical high pressure zones towards the equatorial low pressure zone is what we commonly refer to as trade winds. Therefore, it is correct to say that trade winds blow from the subtropical high pressure zones.