Answer :
C. Christians denied the existence of pagan Rome gods and were shipped only one god.
B. The Christians refuse to follow Diocletians orders that all soldiers and administrators sacrifice the Rome traditional Gods.
Let's talk about the problems:
C. Christians did not allow and/or refused to follow Diocletians orders, this is due to them believing in multiple gods.
B. Christians believe is one god, so they denied the existence of pagan Rome gods and only believed in the God they believe in.