A. Hunan
B. Guangdong
C. Xinjiang
D. Yunnan
🧠 Explanation:
Xinjiang, China, shares a border with Pakistan via the Khunjerab Pass. Studying this highlights regional geography, a key topic in geopolitics. It underscores strategic trade routes like CPEC, with implications for understanding economic and security ties between China and Pakistan, critical for regional connectivity and development.