Which of the following rivers rise in the Himalayan contour of Lahaul and Spiti?

The correct answer is: B. Ravi

The Ravi River is a tributary of the Chenab River in the Indian states of Himachal Pradesh and Punjab. It rises in the Himalayas in the Lahaul and Spiti district of Himachal Pradesh and flows through the Chamba district before entering Punjab. The river joins the Chenab River near Madhopur in Punjab.

The Ravi River is a major source of irrigation for the fields of Punjab. It is also a popular destination for fishing and rafting.

The other options are incorrect because:

• The Jhelum River rises in the Pir Panjal Range of the Himalayas in the Indian state of Jammu and Kashmir. It flows through the Kashmir Valley and into Pakistan, where it joins the Chenab River to form the Indus River.
• The Tawi River rises in the Pir Panjal Range of the Himalayas in the Indian state of Jammu and Kashmir. It flows through the Jammu region of Jammu and Kashmir and into Pakistan, where it joins the Chenab River to form the Indus River.
• The Chenab River is a tributary of the Indus River in the Indian states of Jammu and Kashmir, Himachal Pradesh, and Punjab. It rises in the Himalayas in the Lahaul and Spiti district of Himachal Pradesh and flows through the Chamba district before entering Jammu and Kashmir. The river joins the Indus River near Akhnoor in Jammu and Kashmir.