Final answer:
A screw extractor should be turned using a wrench, because it provides the proper grip and mechanical advantage necessary for the task. Option A is correct.
Step-by-step explanation:
A screw extractor should be turned using a wrench. This is because a wrench, similar to socket wrenches or a power drill, provides the necessary grip and mechanical advantage in applying torque to turn objects like nuts or, in this case, the screw extractor. The motion to use with a wrench can be counterclockwise to loosen or clockwise to tighten, depending on the task at hand.
While pliers might also be used in some situations for grip, they do not usually provide the same level of torque or ease of use as a wrench does for this specific purpose. Also, it's important to avoid using a hammer or a screwdriver to turn a screw extractor, as these tools are not designed for this application and can damage the tool or the workpiece.