Questions: When working in industry with hand tools, and especially with hammers, you should always wear A. ear protection. B. anti-cut gloves. C. safety glasses. D. arm protectors.

The answer is C: safety glasses.

Explanation for each option:

A. Ear protection: This is generally used in environments with high noise levels to protect hearing, but it is not specifically necessary when using hand tools like hammers unless the environment is particularly noisy.

B. Anti-cut gloves: These are used to protect hands from cuts and lacerations, which might be relevant when handling sharp tools or materials, but not specifically necessary for using a hammer.

C. Safety glasses: Correct. Safety glasses protect your eyes from flying debris or fragments that can occur when using a hammer, especially when striking hard materials.

D. Arm protectors: These are used to protect arms from cuts or abrasions, but they are not specifically necessary when using a hammer.

In summary, when working with hammers, wearing safety glasses is crucial to protect your eyes from potential hazards.