Correct Answer: (d) Sitar
Note: Indian music motivated the Muslim society to be passionate towards music. Consequently, Amir Khusrau emerged as a great musician during Sultanate period. He invented "Sitar' with a combination of Irani Tamboora and Indian Veena. He combined some Indian and Persian melodies elegantly and introduced some new melody styles like Iman, Zilf, Sajgari, etc.