Correct Answer:
D. India
The primary monsoon system affecting Pakistan, known as the South Asian monsoon, typically enters the country from the India region. These moisture-laden winds originate over the Bay of Bengal and the Arabian Sea, first bringing rainfall to the Indian subcontinent before progressing northwestward into Pakistan, particularly its eastern and northern areas. This seasonal weather pattern is crucial for Pakistan's agriculture and water resources.
- Central Asia, China, and Afghanistan are located to the north or west of Pakistan. While these regions can influence weather patterns, they are not the source of the main monsoon winds that bring significant rainfall to Pakistan.
- The monsoon's trajectory dictates its entry point, making India the correct answer as the immediate preceding region for the monsoon's arrival in Pakistan.