The correct answer is A) Axum became increasingly isolated from its Islamic trading partners.
The other options of the question were B) Axum became stronger economically and culturally. C) Axum drew closer to its European partners. D) Axum culture flourished even though the kingdom was isolated.
The statement that BEST explains how Christianity influenced the development of Axum after A.D. 600 is "Axum became increasingly isolated from its Islamic trading partners."
The Kingdom of Axum was a powerful Empire in North Africa from the 1st to the 7th century CE. Located in modern-day Ethiopia, its influence reached over Egypt, India, and Arabia. In the 4th century CE, the Aksum empire changed religion to Christianity. Frumentius baptized King Ezana and proclaimed Aksum, a Christian Empire.