What is a major barrier for children using AAC devices compared to their peers?

The correct answer highlights that physical limitations can significantly hinder children's ability to utilize AAC devices effectively compared to their peers. For many children who rely on augmentative and alternative communication (AAC), physical challenges may restrict their ability to interact with the device. This could involve difficulties in mobility, fine motor skills, or even cognitive processing capabilities, making timely and effective communication more challenging.

In contrast, while access to printed materials, the existence of more literacy development options, and higher teacher expectations may present challenges or differences, they do not directly impede the use of AAC devices in the same fundamental way. Instead, these factors can be addressed through support structures, teaching methodologies, or resource availability, which won't have a direct impact on the physical interaction required for the effective use of AAC technology.