Which of the following equipment can produce aerosols?

All of the listed equipment—blenders, sonicators, and mixers—can produce aerosols through their different mechanisms of operation.

Blenders typically create aerosols when they mix liquids with air, especially if they are processing items that can froth or create fine droplets when agitated. The high-speed blades of a blender can incorporate air into the liquid, leading to the formation of small, suspended particles, or aerosols.

Sonicators utilize high-frequency sound waves to agitate liquids, which can lead to erosion at the liquid's surface, causing tiny bubbles that collapse and form aerosols. This process is particularly effective in breaking down substances into finer particles, thus enhancing aerosol generation.

Mixers, especially those that combine liquids or that are used for emulsification processes, can also create aerosols. The action of mixing can trap air within the liquid being combined, leading to the formation of small aerosolized particles.

Given these functionalities, it is evident that all these pieces of equipment can contribute to aerosol production in various ways, thereby making "All of the above" the correct choice.