How does a screen reader assist a blind user operating a touch screen?

A screen reader's primary role is to convert text displayed on a screen into speech, enabling users to interact with the content using auditory feedback. When a blind user operates a touch screen, the screen reader plays a crucial role in providing accessible interactions.

The correct response indicates that the screen reader overrides traditional visual interaction methods. In a touch screen environment, users cannot rely on visual cues; thus, the screen reader utilizes a gesture-based interaction system that allows users to navigate, select, and interact with on-screen elements through touch gestures and audio feedback. This system empowers users to understand what they are touching, making it possible to interact effectively with the interface without needing to see it.

In contrast, the other choices either misunderstand the capabilities of a screen reader or misrepresent its role in assisting users. While visual training, memorizing gestures, or merely reading static content might be relevant in other contexts, they do not accurately describe how a screen reader specifically supports blind users in navigating touch screen devices. The focus of the screen reader is on enabling meaningful interaction and providing context through auditory means rather than relying on memorization or static output.