Increases political participation and attachment to a party
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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Ruomei's new liking for biology has been conditioned.
She was 'conditioned,' aka learned to love biology because of the guy she has a crush on. Previously, she wasn't interested in biology, but when she started liking this guy, she somehow connected her attraction to him to her growing love for biology. Thus, the guy was her stimulus to become conditioned to love biology.