Explanation:

Khyber Pass

• The pass connects Kabul, the capital of Afghanistan, with Peshawar, Pakistan.

• The name Khyber is also applied to the range through which the pass runs.

• The Khyber range is a series of arid broken hills that form the last spurs of the Spin Ghar Range.

• The connecting ridges are the sources of two small streams, the beds of which form the Khyber gorge.

• This gorge forms most of the Khyber Pass, winding between cliffs of shale and limestone.

• At its southeastern end, the pass enters the Khyber Hills from the Shadi Bagiar opening, Pakistan, and it continues northwestward to the Afghan border.

• Landi Kotal is the highest point in the Khyber Pass.

• The pass was part of the Silk Road between Taxila and Kabul, and it was also used by Muslim forces during multiple invasions of the Indian subcontinent.

• It has been a vital trade route between Central Asia and the South Asia.

Hence option 3rd is correct.