Select the Venn diagram description that best illustrates the relationship between the following classes:
Musical Instrument, Kathak, Xylophone

A 'Xylophone' is a specific type of 'Musical Instrument', so the class 'Xylophone' is entirely contained within the class 'Musical Instrument'. On the other hand, 'Kathak' is an Indian classical dance form, which is completely separate from the category of musical instruments.
Therefore, this relationship is best represented by one circle completely inside another, with a third circle completely separate.