Final answer:
Aneurin Bevan became the Shadow Foreign Secretary following the Suez Crisis in 1956, as it reflected Labour Party's opposition to the military invasion of Egypt by the UK government. Option C.
Step-by-step explanation:
The event that led to Aneurin Bevan becoming the Shadow Foreign Secretary was C) The Suez Crisis. The Suez Crisis occurred in 1956 when Egypt nationalized the Suez Canal, previously controlled by French and British interests. The subsequent failed invasion of Egypt by Israel, France, and the United Kingdom led to political upheaval.
Bevan was appointed as Shadow Foreign Secretary in the aftermath of the crisis, reflecting the Labour Party's opposition to the military action taken by the Conservative government under Prime Minister Anthony Eden.
So option C is the correct answer.