The correct answer is C. The content should be presented in a way that can be convertible between different formats, as explicitly stated in the study guide.
“Perceivable” is one of the accessibility concepts tested throughout the UX Designer material. Within this question's framing, information must not be locked into only one sensory presentation. Users should be able to access the underlying content through forms that can support different ways of perceiving it.
Option A limits content exclusively to a visual format, which would create barriers for users who cannot rely on visual presentation.
Option B creates the opposite problem by limiting the content exclusively to audio.
Option C reflects the study guide's expectation that content should be capable of being represented or converted between formats. The underlying goal is to prevent important information from being available only through one mode.
This question therefore reinforces the accessibility principle that interface content should be designed so that different users and technologies can obtain equivalent information even when they do not consume it through the same presentation mechanism.
Study Guide reference/topics: Perceivable content, accessibility, alternative formats, WCAG concepts, UX Fundamentals.
==================================