The movement of tectonic plates in two different locations is shown below: Two blocks labeled Location A and Location B are shown. The block labeled A has a vertical line in the middle. On the left of the line there is an arrow pointing down. On the right of the vertical line there is an arrow pointing up. At Location B the top layer of the block shows two horizontal arrows pointing towards each other. The portion of this block on the right is shown moving down.

Which statement is most likely true?

Subduction occurs in both locations.
Seafloor spreading occurs in both locations.
The magnetic orientation of rocks may change in Location A and subduction occurs in Location B.
Subduction occurs in Location A and the magnetic orientation of rocks may change in Location B.