What year did emperor constantine allow christianity to become legal in the roman empire?

"In AD 313, the Emperor Constantine made Christianity legal and for the first time, they were allowed to openly worship. Churches were quickly built not just in Rome but throughout the empire. In AD 391, the worship of other gods was made illegal."

https://www.historylearningsite.co.uk/ancient-rome/rome-and-christianity/

According to this website, Constantine made Christianity legal in the Roman Empire on AD 313.

lack of interest from state and local governments.

answer; (b) capitalism;