During Abu Bakr's caliphate, the initial compilation of Qur'anic verses into written form was undertaken primarily because
Amany Qur'an reciters (huffaz) were killed in the Battle of YamamaCORRECT
Bthe Prophet had instructed Abu Bakr to do so before his death
Cthe Byzantines had destroyed copies of the Qur'an in conquered territories
Ddifferent tribes were using variant versions of the Qur'an to justify apostasy