Turk Ish and Afghan Invaders Were Able to Conquer Northwest

Turk ish and Afghan invaders were able to conquer northwest I ndia successfully because of

A) the threats of Mongol Il-khans.
B) a desire to spread the Islamic faith and to acquire plunder.
C) excitement at the prospect of learning Indian technology and mathematics.
D) its division into small states after the fall of the Gupta empire.
E) All of these