Final answer:
When using a power screwdriver, you should not touch the bit after it's been used because it can become very hot and potentially cause burns or blisters on your skin.
Step-by-step explanation:
If you are using a drill for a power screwdriver, don't touch the bit after you put it in. It will be hot enough to blister your finger. The correct answer is a) Touch the bit.
When operating power tools like a screwdriver, safety is of utmost importance. The friction that is created when the bit interacts with the screw and the material being worked on can generate a significant amount of heat. That is why you should always wait for the bit to cool down before attempting to touch it, or use appropriate safety equipment like gloves to avoid burns or blisters.