Answer:
Correct answer is B. He legalized Christianity and changed the capital.
Explanation:
Option B is correct because he legalized Christianity with the Edict of Milan in 313 and also created new capital, named Constantinople after him.
A is not correct as he didn't split with Rome, he strengthen the Empire.
C is not correct as he changed the system and ruled as a sole ruler.
D is not correct as he was a part of the council of four, but decided the full authority in the country after defeating Licinius.
The imrpoved agricultural techniques, such as the three field system, the climate change, and the horse plows. These effected Western Europe during the middle ages because the three field system produced better crops, the climate opened more land to farming, and the horse plows allowed faster harvesting. This made life a lot easier for farmers.
No he did not die a few weeks after he became president. He was the third President of the United States from 1801 to 1809