Question

What were two of the reasons for the Great Schism?

disagreement over who was the head of the church

disagreement about what version of the scriptures was more correct

disagreement over the language in which to perform the rites

lack of communication between the two sides due to language and civil and external wars

Answer 1

I am pretty sure that two of the reasons for the Great Schism are being revealed by the option : B.disagreement about what version of the scriptures was more correct. I choose this option because one of the most memorable momens which regfers to that event is actually church split. 
Hope you will agree with me! 
Regards.