Answer:
B: Constantine led the army to victory.
Step-by-step explanation:
The battle of Milvian Bridge was fought as a result of the opposition of the ruler-Constatine.
In the quest of Constatine to maintain his grip on the empire, he engaged in war. It was at the battle of Milivian Bridge that he saw the sign (a cross ) which made him to convert and wear a cross on their shield before engaging in the war which ended up being successful.
After the war, he declared christainity as the official religion of the Roman empire and him the sole ruler