Respuesta :
While you did not state there is more than one correct answer, I believe there is. Four years after the Muslim had made their way into the Sea of Marmara, they raided the Byzantine coasts almost at will. So this proves the answer a) Muslims attacked the Byzantine Empire to be correct. However, it is also true that the Christians did want to spread their religion in addition to taking over certain land that they planned to use as a 'Holy Site.' So this also proves the answer c) Christians wanted to regain control of the Holy Land from the Muslims to be correct.
Answer:
A) Muslims attacked the Byzantine Empire.
and
C) Christians wanted to regain control of the Holy Land from the Muslims.
hope i helped alot :)
Have a great day! <3