Muhammad bin Qasim launched his famous campaign into India in

The young Umayyad general Muhammad bin Qasim entered Sindh in 712 AD at the age of only seventeen. His conquest brought the region under Muslim rule and introduced new systems of administration taxation and cultural exchange. The campaign opened doors for the spread of Islam in South Asia and linked the region to the broader Muslim world. His victory over Raja Dahir at the Battle of Aror is remembered as a defining moment in Indo Muslim history. Thus the correct year is 712 AD which corresponds to option B.