Hello.
The answer is: D, Kings.
The hierarchical levels are:
King / Monarch
Knights/Vassals
Barons/Nobles
Villeins/Peasants/Serfs
Have a nice day
A. Asralobe i think im not 100% sure
Thus, industrialization gave European countries more military power. ... Finally,industrialization made it so that the European countries needed to sell more goods. They had so much ability to produce that they needed captive markets in which to sell the excess.