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In a scenario where there is a low-level temperature inversion accompanied by high relative humidity, the expected weather conditions include smooth air but can significantly hinder visibility due to the presence of fog, haze, or low clouds.

A low-level temperature inversion occurs when warm air traps cooler air at lower altitudes, creating a stable atmosphere that can lead to stagnated air conditions. This stability typically suppresses vertical air movement, which minimizes turbulence. However, when combined with high relative humidity, it results in moisture being trapped near the surface, which can condense and lead to the formation of fog or haze. Such phenomena significantly reduce visibility. Low clouds may also develop under these conditions, further impacting flight safety and navigation.

The other options reflect conditions that are not typical during a low-level temperature inversion with high humidity. Clear skies and high visibility would not be expected due to moisture trapping. Strong turbulence and showers, as well as strong winds and rain, are not characteristic of a stable atmospheric condition created by a temperature inversion. Thus, the correct choice highlights the specific impacts of temperature inversions on visibility and air quality.