The correct option is "the Suez Canal Crisis"
The Sinai War, also called Suez Crisis, or Suez War, was a military war fought over Egyptian territory in 1956, which involved the military alliance formed by the United Kingdom, France and Israel against Egypt with the support in greater or lesser measure of the countries that currently make up the Arab League, of which some support was testimonial because they did not participate.
The Suez Canal, financed by France and Egypt, began operations in 1869, and quickly became a vital link between the United Kingdom and its most important colony, British India. Given this relevance, the United Kingdom bought its share from the Egyptian Government. The canal retained its importance even after the independence of India, since it became the main route to transport oil from the Persian Gulf to Europe, which was vital for all Western European economies.