Which of the following features is offered by the residence halls?

The option indicating free laundry is indeed a feature commonly offered by residence halls. This amenity provides significant convenience for students, allowing them to manage their laundry without the additional financial burden of coin-operated machines in some off-campus housing situations. Having free laundry facilities often enhances the living experience in residence halls, making it easier for students to maintain cleanliness and manage their time effectively.

Other amenities, such as free toiletries, swimming pool access, or private rooms for all students, can vary greatly between institutions and are not universal features of residence halls. While some may offer swimming pools or private rooms in certain circumstances, these are not standard provisions across all residential facilities. Similarly, toiletries are typically a personal responsibility, and students often need to procure their own supplies. Therefore, the presence of free laundry stands out as a widely accepted feature of residence halls.