To answer this question, you need to have knowledge about the origin of the Indus River system.
Option A) Southern slopes of Kailash - This option is incorrect. The Indus River system does not originate from the southern slopes of Kailash.
Option B) Northern slopes of Kailash - This option is correct. The Indus River system originates from the northern slopes of Kailash. The river starts from the Mansarovar Lake in Tibet and flows through the Ladakh region of India.
Option C) Eastern slopes of Kailash - This option is incorrect. The Indus River system does not originate from the eastern slopes of Kailash.
Option D) Western slopes of Kailash - This option is incorrect. The Indus River system does not originate from the western slopes of Kailash.
The correct answer is B) Northern slopes of Kailash. This option is correct because the Indus River system does indeed originate from the northern slopes of Kailash.