Final answer:
A disadvantage of using a fragment to use the Preferences API is that it adds complexity to preference handling, thus correct option is C.
Step-by-step explanation:
A disadvantage of using a fragment to use the Preferences API to display preferences is that it adds complexity to preference handling. Fragments are a way to modularize and reuse UI components in Android applications, but they can make preference handling more complicated due to the need to manage the lifecycle and communication between fragments and activities. When using fragments, developers need to carefully consider how preferences are accessed and updated to ensure proper functionality.
For example, if a preference is updated in one fragment, other fragments that display the same preference need to be notified and updated accordingly. This requires handling events and implementing communication mechanisms between fragments, which can increase code complexity and development effort.
While fragments themselves do not prevent the use of the Preferences API or directly interfere with displaying preferences, they introduce additional considerations and challenges that developers need to address when using the API in the context of fragment-based UI.