Which effect best completes the diagram? a. with official support, christianity began to spread rapidly  and flourish throughout the empire. b. with official support, christian armies began to retake territories previously  lost to the muslims. c. even with the emperor's support, christianity remained an  insignificant religion until the end of the empire. d. even with official support, the christian religion  could not  end the worship of  pagan gods such as  mithras.