Why Did Egypt Emerge as a Potent Symbol of Pan-Arab

Why did Egypt emerge as a potent symbol of pan-Arab nationalism in 1956?

A) Egypt's military under Nasser was able to reclaim the Suez Canal from the British, French, and Israelis.
B) Because Egypt was the site of the oldest civilization in the region, it had great prestige.
C) Egypt was the site of origin of the Muslim Brotherhood, which soon came to power after they overthrew the king.
D) Egypt had been the capital of the last Muslim Caliphate, so it was the symbolic home of pan-Arab sentiments.