Which type of turbulence is associated with objects disrupting airflow?

The correct choice emphasizes mechanical turbulence, which occurs when airflow is disrupted by physical objects or terrain features, such as buildings, mountains, or trees. These objects can create wake turbulence as air flows around and over them, resulting in irregular and variable wind patterns in the vicinity.

Unlike thermal turbulence, which is caused by temperature differentials in rising or descending air, or frontal turbulence, which occurs at the boundary of different air masses, mechanical turbulence specifically involves interactions between the air and solid structures. Wind shear turbulence, while related to differences in wind speed and direction at varying altitudes, does not directly result from the obstruction caused by physical objects. Thus, mechanical turbulence stands out as the form specifically linked to objects disturbing the normal flow of air, making it the correct answer.