How did the structure of the Christian Church change after the Council of Nicaea?

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Explanation:

The council was attended by about 300 bishops from across the Roman Empire, especially from the eastern provinces. Interestingly, the pope at that time, Pope Sylvester I, was not present at the council, though he had two representatives. Although Constantine was also present at the council, and presided over it as an honorary president, he left the direction of the theological debates to the ecclesiastical leaders. One of the most important outcomes …

a king decides to declare war on a neighboring country without the input of any advisers

i think the answer is   b.