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Wide doorways are essential for accessible design to accommodate mobility because they enable individuals using wheelchairs, walkers, or other mobility aids to enter and exit spaces without obstruction. Accessibility standards, such as those set by the Americans with Disabilities Act (ADA), specify minimum widths for doorways to ensure that they can accommodate the size and turning radius of mobility devices. This characteristic allows for safe and easy access to various areas within buildings, ensuring that individuals with mobility challenges can navigate spaces independently and comfortably.

The other options do not contribute positively to accessibility. Multiple stairs can create barriers for those with mobility issues, high countertops may be difficult for wheelchair users to utilize, and low windows could affect privacy and functionality for individuals who may be seated. Thus, wide doorways are the critical feature that supports increased accessibility in design.