The W3C Authoring Tool Accessibility Guidelines focus on what main issues for GUI editors?

The W3C Authoring Tool Accessibility Guidelines are primarily concerned with the usability of authoring tools for individuals with disabilities. The focus is on ensuring that these tools generate accessible content and are usable by people who may have disabilities, such as those who rely on assistive technologies. By maintaining a strong emphasis on code generation, the guidelines help ensure that produced web content meets accessibility standards, allowing a broader audience to access and interact with the information.

This approach is crucial because proper code generation can facilitate better compatibility with screen readers and other assistive devices, while usability refers to how effectively individuals with disabilities can use the tools themselves to create accessible content. Hence, option B accurately captures the essence of the guidelines' objectives, addressing both the creation of accessible content and the usability of the tools for those with disabilities.