Read the passage. The Northmen came to Paris with 700 sailing ships. This is not counting those of smaller size which are commonly called barques. At one stretch the Seine was lined with the vessels for more than two leagues. You could ask in astonishment in what cavern the river had been swallowed up. There were so many boats the river could not to be seen.

–Adapted from "Wars of Count Odo with the Northmen” by Abbo

What is the central idea of the passage?

Parisians were caught asking what cavern had swallowed up the river.
Smaller boats sailing on the Seine were commonly called barques.
The Northmen filled the Seine with so many boats that the river could not be seen.
The Northmen’s sailing vessels lined up along the Seine for more than two leagues.

B) It was spread by European missionaries.

Explanation:

Officially, the entry of Christianity occurred in the 4th century AD, when St. Frumentius brought the message of the Gospel from Rome to the kingdom of Aksum, which covered what is now the northeast territory of Ethiopia and Eritrea. The emperor of that time, Ezana, accepted the messenger's words and "the word of God" spread throughout his kingdom with remarkable receptivity. St. Frumentius was named as the first "Abuna" of Ethiopia, head of the Ethiopian Orthodox Church.

What is curious is that in the sixth century, the churches in Egypt and Ethiopia, which followed the patriarch of Alexandria (a city in northern Egypt founded in 331 BC by the Roman Emperor Alexander the Great), separated from Rome and founded their own Coptic or Orthodox church, with its own liturgy, symbols and legends.