The movement of tectonic plates in two locations is described below:

location a: tectonic plates move away from each other
location b: tectonic plates collide and one plate moves beneath the other

which statement is most likely correct? (7 points)
magma may rise and form volcanoes in both locations.
there is no chance of earthquakes in the two locations.
subduction happens in location a but not in location b.
seafloor spreading happens in location b but not in location a.