Which is the reason that historians started to use the terms B. C.E. and C. E. instead of B. C. and A. D. when using dates? A) Historians began to use new carbon methods of dating B) B. C.E. and C. E. refer to "common era" and have no religious association. C) B. C.E. and C. E. refer to "Christ's era" and are more Christian terms D) Historians realized the old calendars were off and had to start all over