In 313 AD the Roman emperor Constantine I published the Edict of Milan, which established that

A)
paganism was outlawed in the empire.

B)
it was illegal for soldiers to be Christians.

C)
Christians were freed from religious penalties.

D)
all Roman citizens were required to convert to Christianity.

C. Christians were freed from religious penalties.

Explanation: Edict of Milan, proclamation that permanently established religious toleration for Christianity within the Roman Empire. It was the outcome of a political agreement concluded in Mediolanum (modern Milan) between the Roman emperors Constantine I and Licinius in February 313.

the enslaved people onboard suffered from illness with some frequency

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.