Which of the following best describes proximity qualifiers?

Proximity qualifiers are terms used to indicate the intensity or amount of precipitation observed, and "light," "moderate," and "heavy" specifically describe the varying intensities of precipitation. These terms provide essential information to pilots and meteorologists about the expected conditions they might encounter.

In weather reporting, accurate descriptions of precipitation intensity are crucial, as they help in making informed decisions regarding flight operations, safety considerations, and potential weather impacts on visibility and aircraft performance. Understanding the intensity through these qualifiers allows for a clearer assessment of current weather conditions.

The other options do not relate to how precipitation is specifically qualified in meteorological contexts. "Weak and strong" could refer to various strengths but lacks direct application to precipitation. "Close, far, nearby" deal more with spatial relationships than intensity, while "visibly clear, cloudy" pertains to visibility conditions rather than quantifying precipitation. Thus, "light, moderate, heavy" is indeed the most accurate descriptor for proximity qualifiers in the context of precipitation observations.