Final answer:
Early church historians assert that the Gospel of Mark reflects the testimony of the Apostle Peter.
Step-by-step explanation:
Early church historians claim that Mark recorded the testimony of the Apostle Peter. Mark, considered one of the four Evangelists, authored the second Gospel in the New Testament, and his account is believed to reflect the teachings and experiences of Peter. This connection between Mark's Gospel and Peter's testimony is significant in understanding the origins of the Christian texts and how they were transmitted through the early Christian communities.