Answer:
A (As far as my knowledge goes, I might be wrong)
Explanation:
A. Trade was increased, so this is the right answer
B. The European Christians did not win the Holy Land from the Muslims, so this is the wrong answer
C. Although art and music was inspired by the Crusades, it's subjective, and I'm assuming this isn't multiple choice.
D. The crusades was a fight over religion, this isn't even possible
The term you're describing is p<span>rotectorate. These nations do have their own government but don't have a good enough military to defend themselves. They rely on stronger countries to help them in time of war.</span>
