How was roman emperor constantine i's adoption of christianity similar to charles martel's victory in the battle of tours? a. both events legalized christianity in areas where it had been illegal. b. both events were examples of christianity's unifying effects in europe.
c. both events were examples of christian victory over islamic forces. d. both events made christianity the official religion of a nation.

Here the only good choice is B.

Explanation:

Constantine´s decision to make Christianity the official religion of the empire was largely based on political considerations, enhancing the unity of the Roman Empire. Charles Martel´s victory at the head of combined Christian forces at the Battle of Poitiers (also Battle of Tours) in 732 stopped Islamic advance in Europe. The other options don´t make sense at all.

its B just took the quiz

Explanation:

a

explanation: