Which Window of Sky point is located at ST-9?

The Window of Sky point located at ST-9 is indeed SI-17. Window of Sky points, also known as Window of Heaven points, have significant importance in Traditional Chinese Medicine, as they are believed to help with disorders of the head and neck, as well as emotional disturbances.

ST-9, specifically, is located on the neck at the level of the larynx. This point has various functions, including the ability to regulate Qi and blood in the neck region. While the other choices represent various acupuncture points that may also influence the neck or head area in some manner, SI-17 is unique in its designation as a Window of Sky point, emphasizing its specific role in addressing issues related to the upper body and the head, particularly concerning emotional and spiritual aspects.

In summary, SI-17 aligns with the characteristics and functions attributed to Window of Sky points, making it the correct response.