The correct answer is C) wearing protective gloves and goggles when handling electrolyte. Explanation: 1) The correct answer is C, as alkaline batteries do not use a liquid electrolyte that requires checking or replacement. The electrolyte in alkaline batteries is a solid paste, so options A, B, and D are not applicable. 2) When performing maintenance on alkaline batteries, it is important to wear proper personal protective equipment (PPE) such as gloves and goggles to avoid exposure to the battery's contents, which can be corrosive. This is the key safety precaution for working with alkaline batteries. 3) The other options are incorrect because they are not relevant to the maintenance of alkaline batteries, which do not require electrolyte checking, replacement, or monitoring voltage per cell. 4) In summary, the correct answer is C, as wearing protective gloves and goggles is the appropriate safety measure when handling alkaline battery electrolyte during maintenance.