Final answer:
To properly use a jigsaw, you should always wear safety glasses to protect your eyes and allow the tool to work without forcing it to prevent blades from breaking. Pushing harder or using a dull blade is not recommended.
Step-by-step explanation:
The question relates to the proper use of a jigsaw tool. When first using a jigsaw, it's important to prioritize safety and the integrity of the tool and the material being cut. The correct answer to the question is: c) Wear safety glasses. Forcing a jigsaw can cause the blades to break, so it's essential to use the right techniques and safety precautions.
A dull blade will make cutting more difficult and is more likely to break, therefore it's not recommended. Pushing harder is exactly the action that can lead to broken blades. A lubricated blade might make the cutting smoother but is not a safety measure and not pertinent to preventing blade breakage directly.
It's essential to always wear safety glasses to protect your eyes from any debris or particles that can arise while cutting. The jigsaw should be allowed to do the work without excessive force, and if the cutting becomes difficult, checking the sharpness of the blade and replacing it if necessary is a better practice than forcing the tool.