With whom did mark go on his second missionary journey?
peter
paul
barnabas
john
silas

This is recorded in the book of Acts in the Holy Bible. One day Paul said to Barnabas: “Let’s go back and visit each city where we previously preached the word of the Lord, to see how the new believers are doing” Barnabas agreed and wanted to take along John Mark. However, Paul disagreed strongly, since John Mark had deserted them in Pamphylia and had not continued with them in the labor of preaching the Gospel. Their disagreement was so sharp that they separated. So Barnabas took John Mark with him and sailed for Cyprus.

d. people are naturally good, and their expressed will is what is best for society

explanation:

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).