The correct answer is Hindu Kush, Hindu Kush Mountains, The Hindu Kush Mountains. These options refer to different ways of mentioning the same geographical feature, which is the mountain range known as the Hindu Kush. The term "Hindu Kush" is commonly used to refer to this mountain range, and it can be mentioned as either "Hindu Kush" or "Hindu Kush Mountains". Additionally, "The Hindu Kush Mountains" is another way to refer to the same range, emphasizing its status as a mountainous area.