What SLOWED the spread of Christianity? B. The fact that Christians were tolerant of other religions
A. Christians belief in ritual sacrifice
D The religion was legalized by Constantine
c Christians were persecuted by Roman authorities

i believe the answer is C Christians were persecuted by roman authorities.

Explanation:

The advance of Christianity slowed after 500 as the Roman Empire, with which it had become identified, disintegrated. In the 7th and 8th centuries, Arab invasions established Islam as the dominant religion in about half the area in which Christianity had been dominant.

step-by-step explanation:

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;