Answer: The Boat Operator.
Explanation:
Since the Muslims were the once attached (by the Christians) their action was mostly to respond and defend themselves; rather than undertake other initiatives.
The Crusades have caused the Muslims to unite more, but generally their reaction was very weak and not long-lasting.
The answer is this chart demonstrates the marginal cost initially decreases as production increases.
B. i’m pretty sure don’t take my word for it