0The appropriate answer is B. Seawater seeps out of the ocean floor through cracks in the crust.
Hydrothermal vent occur at mid oceanic ridges that stretch along the ocean floor. These regions mark the boundary where two tectonic plates are moving away from each other.
This is called a divergent plate boundary. As the plate moves apart magma from the mantle upwells and heats water in the crust. This super heated, mineral rich water is released through hydrothermal vents.
