Answer:
B. He granted freedom of religion in the Roman Empire is your best answer.
Explanation:
A is just one of the results occuring after he ended the persecution of Christians.
For C, he did not "introduce" Christianity, but he legalized it and made it the official religion of the Roman Empire.
For D, the Roman Empire was already a pagan empire, and Constantine made it a Christian Empire.
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The correct answer is The Family Dog.
The Family Dog Productions, founded by Chet Helms, a music promoter, was famous for organizing many dances of psychedelic nature at ballrooms in San Francisco. They were quite popular, especially during this era of Summer of Love (1967), and were associated with performers such as Janis Joplin, Jimmy Hendrix, and others.