(A) Afghanistan
(B) Iran
(C) China
(D) India
🧠 Explanation:
- Iran is located to the west of Pakistan, sharing a long border with Balochistan province.
- The Pak-Iran border is known as the "Goldsmith Line" and stretches over 900 kilometers.
- Iran and Pakistan maintain cultural, historical, and economic relations due to their close proximity.
- This western border plays an important role in regional trade and security cooperation.
