Question: What caused the resurface of the Grecian monotony in politics ?

Is "A distinct Greek political identity re-emerged in the 11th century in educated circles and became more forceful after the fall of Constantinople to the Crusaders of the Fourth Crusade in 1204, so that when the empire was revived in 1261, it became in many ways a Greek national state." the correct answer?
OPTIONS:
a). yes
b). no
a).