Which of the following tributaries of Sutlej river forms the boundary between Punjab and Himachal Pradesh?

The correct answer is: B. Baspa

The Baspa River is a tributary of the Sutlej River. It originates in the Kinnaur district of Himachal Pradesh and flows through the Chamba district of Himachal Pradesh and the Kangra district of Himachal Pradesh before joining the Sutlej River in the Bilaspur district of Himachal Pradesh. The Baspa River forms the boundary between Punjab and Himachal Pradesh for a short distance in the Chamba district.

The other options are incorrect because:

• Nagli Khad is a tributary of the Beas River.
• The Ganga River is a major river in India. It originates in the Garhwal Himalayas in Uttarakhand and flows through the states of Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, West Bengal, and Bangladesh before emptying into the Bay of Bengal.
• The Soan River is a tributary of the Chenab River. It originates in the Pir Panjal Range in the Chamba district of Himachal Pradesh and flows through the Chamba district, the Jammu district, and the Kathua district of Jammu and Kashmir before joining the Chenab River in the Kathua district.