Which of the following audio formats is acceptable in Unity?

The correct answer is Aiff, which is an audio format commonly used for high-quality sound storage. Unity supports a variety of audio file formats for importing sound effects and music into projects, and Aiff is one of those formats. This makes it suitable for game development, as developers can utilize high-fidelity audio content to enhance the overall gaming experience.

The other options do not relate to audio formats. JPEG is an image format, TXT is a text file format, and HTML is a markup language for creating web pages. None of these would be appropriate for audio playback within Unity. By understanding the types of file formats Unity accepts, developers can effectively choose the right assets to include in their projects.