Arabic Is Diglossic Because

Arabic is diglossic because:

A) Arabic writing moves from right to left
B) Like Hebrew, Arabic is a recently revitalized language
C) Arabic phonology is categorized into two forms: jargon and slang
D) The semantic structure of written Arabic is different than the phonology of regional varieties
E) Two separate forms of the language are used for different functions and purposes; standard Arabic is generally used for religious or formal writing while regional or national dialects are used for everyday speech