Answer:
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.
Czar nicholas II place himself in charge of armies
3) claims sovereignty over the same land
The answer is : C. Computers
There's no way computers play important role in 1950s youth culture because The home type computers just entered the market around 1977 and become common around the consumers in the late 1980s