Question

Which of the following groups conquered northern India around 1200 CE?

Answer 1

"Like other settled, agrarian societies in history, those in the Indian subcontinent have been attacked by nomadic tribes throughout its long history. In evaluating the impact of Islam on the sub-continent, one must note that the northwestern sub-continent was a frequent target of tribes raiding from Central Asia. In that sense, the Muslim intrusions and later Muslim invasions were not dissimilar to those of the earlier invasions during the 1st millennium." 
Richard M. Frye, "Pre-Islamic and Early Islamic Cultures in Central Asia", in Turko-Persia in Historical Perspective, ed. Robert L. Canfield (Cambridge U. Press c. 1991), 35–53."

So, MUSLIMS is the answer, does it have this option?