Answer:
Roman gods began to more closely resemble Greek gods.
Step-by-step explanation:
Roman gods were based off of Greek gods, they had the same stories cause after all Rome did come out from Greece and took many of it's traditions at the beginning of the Empire. Christianity only became the official religion of Rome towards the middle/end not the beginning. And the other two just don't sound correct, so I would go with "Roman gods began to more closely resemble Greek gods."
Sorry if I'm wrong!