Which of these is true about the radiator shutters and the winterfront during winter driving?

The correct choice highlights the importance of maintaining the radiator shutters during winter driving conditions. Ice accumulation on radiator shutters can significantly hinder airflow to the engine. This obstruction can lead to overheating because the engine relies on proper airflow for cooling. When ice forms, it blocks necessary air from reaching the radiator, impairing the cooling system's effectiveness.

While the other options discuss various aspects of how radiator shutters work in conjunction with winterfronts, they do not emphasize the critical role that maintaining unobstructed airflow plays in preventing engine overheating. Removing ice from radiator shutters ensures that the engine cooling system operates efficiently, which is essential for safe and effective operation during colder months.