The turning point in the rise of the Ottomans as a dynasty controlling the mightiest empire in the world was:
A. The conquest of Constantinople, the famous capital of the Byzantine.
B. The re-establishment of the Shura as the classic Islamic method of leadership election.
C. Creating a system of military meritocracy where the best general is elected to lead the empire.
D. Defeating the Persian Shia Empire in the East and expanding to the Indus River.