What type of ventilation dilutes indoor air with a supply of fresh air?

The correct choice of general ventilation pertains to the method of improving indoor air quality by diluting stale air with fresh air from the outside environment. This type of ventilation aims to ensure a consistent supply of fresh air throughout a space, affecting the overall air quality by lowering pollutant levels and enhancing comfort. General ventilation systems can be mechanical or natural and are designed to circulate and refresh air in an entire building or large area, rather than targeting specific localized spots.

Local ventilation, on the other hand, focuses on removing contaminants or excess heat from particular areas and does not aim to refresh the air in the entire space. Convection ventilation refers to the natural movement of air due to temperature differences, which may not effectively supply fresh air. Technical ventilation typically describes systems that rely on more complex technologies, which might involve some form of fresh air supply but do not directly characterize the broad approach of diluting indoor air like general ventilation does. Therefore, general ventilation is the most appropriate answer for the process described in the question.