The correct answer is option 3 - Afghanistan and Pakistan. The Khyber Pass is a narrow mountain pass that connects Afghanistan with Pakistan. It is located in the Khyber Pakhtunkhwa province of Pakistan and the Nangarhar province of Afghanistan. The pass has been historically significant as it is part of the ancient Silk Road, serving as a major trade route between South Asia and Central Asia. It has also played a role in military invasions and expeditions throughout history. The Khyber Pass is a vital transportation route, facilitating cross-border trade and providing access for military movements between Afghanistan and Pakistan. It is an important strategic location that has been of great importance in the region for centuries.