The best comparison of the church in the Roman and Byzantine Empires among the given options is:
Both empires embraced Christianity, but the Byzantine Empire based its practices and rituals in the Greek language and culture, rather than in the Latin language and culture.
This response accurately reflects the differences in the religious practices, cultural influences, and linguistic contexts in which Christianity was practiced in the two empires. The Byzantine Empire, which developed from the Eastern Roman Empire, primarily used Greek in its liturgy and church practices, while the Western Roman Empire primarily used Latin.