Under what conditions does icing most often occur in automotive systems?

Icing in automotive systems most often occurs on cool damp days due to the combination of lower temperatures and the presence of moisture in the air. When the temperature is just above freezing, the moisture can condense and freeze on various components, such as the vehicle's air intake or the engine. This phenomenon can lead to issues such as decreased engine efficiency or performance, as icing can obstruct airflow or affect fuel delivery systems.

While winter storms can also create icy conditions, the key factor in the option that is correct is the consistent presence of moisture along with cool temperatures typically found on damp days. Hot sunny days would not present a risk for icing, as increased temperatures would keep moisture in liquid form rather than allowing it to freeze. High humidity alone, without cooler temperatures, does not necessarily lead to icing but rather contributes to the overall moisture content in the air.