Subduction happens in Location A but not in Location B.
Explanation:
In the two descriptions, we have two different types of plate boundaries. At location A, where the plates collide, and one moves over the other while the other is pushed downward, we have a convergent plate boundary. At location B, where the plates slide past each other, we have a transform plate boundary.
At location A, a subduction zone will occur. The subduction zone will appear at the point where the two plates collide, and if it is in the ocean, there will be a trench, if it is on land, a mountain chain will be forming.
At location B, there will not be a subduction zone, instead, there will be a fault. A fault will occur because of the sliding past each other of the plates, as they create big pressure between each other, so at the boundary itself, there will be cracks in the crust where the crust is under immense pressure and it often results in earthquakes.
