What is a feature associated with a temperature inversion?

A temperature inversion is characterized by a stable layer of air that occurs when warmer air traps cooler air near the ground. This happens when the temperature increases with altitude, which is opposite to the normal atmospheric conditions where temperature typically decreases with altitude. When this inversion layer is present, it inhibits vertical mixing of air, leading to more stable atmospheric conditions. As a result, weather phenomena such as clouds and turbulence are often limited.

In contrast, the other options suggest characteristics that are inconsistent with the stability provided by a temperature inversion. Turbulent air masses, increased thunderstorm activity, or an unstable layer of air would indicate a vertical mixing of air and instability, which is not present in the situation described by a temperature inversion.