Which of the following best describes how to avoid parallax error when reading a meter?

The best way to avoid parallax error when reading a meter is to use a mirror to view the pointer. This method ensures that you can see the pointer's position without the distortion that occurs when viewing it from an angle. Parallax error happens when the scale of the meter is viewed from a position that is not directly aligned with the pointer, leading to incorrect readings. By using a mirror, it allows you to effectively see the pointer's reflection at eye level, minimizing any discrepancies caused by angle differences.

The other options may attempt to mitigate errors, but they do not directly address the issue of perspective. For example, looking directly above the meter may not always be practical or possible depending on the design of the meter, and tilting the meter could introduce its own errors or distortions. Adjusting the light around the meter might improve visibility but does not eliminate the risk of parallax errors that arise from improper alignment of the viewer's line of sight with the scale.