Why were the first sultans of Delhi known as the slave dynasty? Why did Mahmud of Ghazni invade India?

-the first sultans of Delhi known as the slave dynasty because he and several of the sultans who claimed succession from him were originally military slaves.    

-they are two main reasons that led to the conquest of India by Mahmud Ghazni was firstly, to accumulate the vast amount of wealth that existed in India, and secondly, to spread Islam.                                                                     Explanation:

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answer; ///i believe that the correct answer is (b); ///the candidate must be a native born american citzen;