The correct answer is C. The Egyptian nationalization of the Suez Canal and the International reaction.
When Egyptian President Abdel Nasser announced the nationalization of the Suez Canal Company the British and the French - who operated the Canal since it’s construction in 1869 - opposed to it and it caused political tensions between the countries. Israel, Great Britain, and France invaded the country and planned to overthrow the President. The Eisenhower administration pressured those countries and they accepted a ceasefire.