How Did Hinduism Respond to the Challenge of Islam

How did Hinduism respond to the challenge of Islam?

A) Hindus abandoned their emphasis on many deities in favor of monotheism in the person of Shiva.
B) Hindus placed greater emphasis on the devotional or bhaktic cults of gods and goddesses such as Shiva and Vishnu.
C) Hindus converted to Islam in increasing numbers, until Muslims outnumbered Hindus in the subcontinent.
D) The brahmins accepted Islam as a variety of orthodox Hindu belief, while anticipating the incorporation of the Muslim immigrants into the Indian caste system.