Concept:The Non-Aligned Movement (NAM) held its second summit in Cairo, Egypt, in October 1964, and Nigeria participated as a non-aligned state.Explanation:The first NAM summit took place in Belgrade in 1961.The second summit was hosted in Cairo, Egypt, from October 5 to 10, 1964.At that time, Egypt was officially known as the United Arab Republic.Nigeria attended this meeting in 1964 as part of its non-aligned foreign policy.Answer:Option C: 1964.