The correct answer should be 70 because it is the number that agrees with the correct number more than others. A comprehensive list would include a higher number, but some states that joined no longer exist.
Explanation: The United Nation is an International Organisation which was founded in 1945. Today 193 states are the members of the speaker National Organisation. When it was founded it has only 51 members which were entitled as the original members. The number kept on increasing from 51 to 193. The answer to the question is that 70 states added to this organisation from 1946 to 1969.
