The correct option is B There is no difference between Hindu and Muslim.
Guru Nanak's first words following his enlightenment were 'Na Koi Hindu, Na Koi Musalman' which translates to 'There is no Hindu, there is no Muslim'. He explained his statement to Brahmins and Qazis by saying that there is no difference between a Hindu and a Muslim as both of them are children of the same God.