The correct answer is - 1. Monarch 2. Lords 3. Vassals. 4. Peasants.
The Monarch was the one that was the leader of the country, he had an unlimited power and authority, and his word was law.
The lords had regional power and authority. They had big amounts of land, and also supporters and private armies. They had some autonomy, but still had to obey the monarch.
The vassals were people with local power and authority. They were given smaller pieces of land by the lords so that they have their support in return.
The peasants were on the bottom of the hierarchy. They did not owned land and didn't really had any authority and had to obey all of the above. They were by far the most in number, but also the poorest.