The correct answer is A) decline as a world power.
Following World War II, Middle Eastern and African countries gained independence from colonial rule. This was a result of England's decline as a world power.
After World War II, European countries such as Great Britain suffered from economic restructure and had to deal with reconstruction and ineternal issues. After so many years of colonial presence in Africa, it was the time to leave the black continent and let their own governments rule their nations. No more interventionism in the region. Among others, Libya got its independence on December 25, 1951, Sudan on January 1, 1956, and Ghana on March 6, 1957.