What Was the Difference Between the Islamic Invasions of India

What was the difference between the Islamic invasions of India and previous incursions of the subcontinent?

A) With the Muslims, the peoples of India encountered for the first time a large-scale influx of invaders with a civilization as sophisticated as their own.
B) With the Muslims, the peoples of India encountered for the first time an invasion from the west rather than the east.
C) The Muslims were rapidly able to unify all of India into a single empire.
D) The Muslims, unlike previous invaders, bypassed the Gangetic plain in preference for southern India.