The correct answer is B) Reversing the field or armature connections. To reverse the direction of rotation of a DC motor, you need to reverse either the field or the armature connections. This is because the direction of rotation is determined by the interaction between the magnetic field and the current flowing through the armature. Reversing either the field or the armature connections will reverse the direction of the magnetic field, resulting in a change in the direction of rotation. The other options are incorrect because: A) Wiring the field and armature in series would not reverse the direction of rotation, C) Reversing both the field and the armature connections would not change the direction of rotation, and D) Wiring the field and armature in parallel would not affect the direction of rotation.