Step 1: Understanding the Question:
This question belongs to the topic of physical geography and international borders.
It asks for the precise location of the historic mountain pass known as the Khyber Pass.
Step 2: Key Formulas and approach:
We need to identify the geopolitical entities and mountain ranges associated with the Khyber Pass.
The pass has historically served as a critical trade and invasion route between Central Asia and the Indian subcontinent.
Step 3: Detailed Explanation:
• The Khyber Pass is a mountain pass in the northwest of Pakistan, cutting through the Spin Ghar mountains.
• It connects the town of Landi Kotal in Pakistan to the valley of Peshawar and further reaches Kabul in Afghanistan.
• Throughout history, it was an integral part of the ancient Silk Road and a key gateway for invasions into India by rulers like Babur, Nadir Shah, and Ahmad Shah Durrani.
• Geographically, it sits right on the international border known as the Durand Line, which demarcates Pakistan and Afghanistan.
• The other country pairs listed (Pakistan-Nepal, India-Nepal, India-Bangladesh) are geographically distant from the Spin Ghar/Hindu Kush mountain ranges where the pass is situated.
Step 4: Final Answer:
The historic Khyber Pass is situated directly on the international border between Pakistan and Afghanistan, making Option (A) the correct choice.