Answer: B. Both are caused by subduction zones.
In a subduction process, there is a recycling of the oceanic lithosphere into the earth’s mantle. This occurs in the subduction zone and is known to have led to the creation of most of the earth’s continental subduction zones are found in volcanic regions. In subduction regions, earthquakes are very recurrent and the fluids that leaves the subducting plate triggers volcanism in the overriding plate. Some examples of volcanoes found above subduction zones are Mount Fuji and Mount St. Helens. The deepest quakes on earth are found in subduction zones and they tend to be very anomalous.