Answer:
Correct answer is: B. Muslims fought to protect land sacred to them from outside invaders .
Step-by-step explanation:
Option A is not correct as this would be perspective of some historian or eyewitness who supported the Crusades.
B is correct as Arab historians would explain why it was justified to defend themselves from the attack of the Crusades.
C is not correct as this would be a modern perspective of historians who stressed the good consequences of Crusades.
D is not correct as this conclusion cannot be drawn by anyone.