Answer:
The correct answer is B and D Paul the Apostle set up the Orthodox and Catholic churches.
Step-by-step explanation:
Paul the Apostle was a first Christian missionary, who was travelling across Mediterranean and spreading the word of Christ. He was killed in Rome on the order of Emperor Nero, but still his work outlived him, as he set up basis for the development of Christian church.
A is not correct, as the Church was officially divided in the 11th Century.
C is wrong, because as we know Christ was killed by the Romans, not protected.