The correct option is B Belgrade (Yugoslavia)
The Non-Aligned Movement is a movement of 120 developing nations which decided to remain neutral and decided not to align with any or against any major bloc. The movement was established in 1961 in Belgrade, Yugoslavia under the leadership of the Josip Broz Tito. The movement was formed during the cold war era. The preparatory meeting for the first NAM Summit conference was held in Cairo Egypt from 5-12 June 1961 and the First Official Summit Conference was held in Belgrade, from September 1 to 6.