Correct Answer:
A. Khyber Pass
It is widely believed by historians and archaeologists that the Aryans, an ancient Indo-Iranian people, entered the Indian subcontinent through the Khyber Pass. This historic mountain pass, connecting Afghanistan and Pakistan, has served as a crucial trade and invasion route for centuries, facilitating migrations and cultural exchanges. While Bolan Pass, Gomal Pass, and Malakand Pass are also significant passes in the region, the Khyber Pass is most strongly associated with the Aryan migration into India.