How did the romans conquer so much land? they used the roman army to invade and take the land. they paid people to leave their land so they could take it. they dropped bombs and killed the people who lived there.

Your answer should be "They used the Roman army to invade and take the land."

The third answer is wrong for the time of the Roman army and the second doesn't make sense. With such a strong army, many countries just relented to them rather being conquered or killed, so why would the Romans pay?