The correct answer is (b).
Khalid B. Sayeed was a Pakistani political scientist and historian. He is best known for his work on the history of Pakistan, including his book Pakistan: The Formative Phase.
W.C. Smith was a British religious scholar who specialized in Islam. He is best known for his book The Meaning and End of Religion.
Peter Hardy was a British historian who specialized in the history of Islam. He is best known for his book The Muslims of British India.
Moin Shakir was an Indian historian who specialized in the history of Islam in India. He is best known for his book Modern Islam in India.