Answer the questions based on the passage:

The First World War encouraged the world to invest in an international organisation to deal with conflict. Many believed that such an organisation would help the world to avoid war. As a result, the League of Nations was born. However, despite its initial success, it could not prevent the Second World War (1939-45). Many more people died and were wounded in this war than ever before. The UN was founded as a successor to the League of Nations. It was established in 1945 immediately after the second World War.

The organisation was set up through the signing of the United Nations Charter by 51 states. It tried to achieve what the League could not between the two world wars. The UN's objective is to prevent international conflict and to facilitate cooperation among states. It was founded with the hope that it would act to stop the conflicts between states escalating into war and, if war broke out, to limit the extent of hostilities. Furthermore, since conflicts often arose from the lack of social and economic development, the UN was intended to bring countries together to improve the prospects of social and economic development all over the world. By 2011, the UN had 193 member states.

The League of Nations could not prevent which of the following wars which ultimately led to its demise?

Second World War

The correct answer is Option (3) → Second World War

The passage explicitly states, "However, despite its initial success, it could not prevent the Second World War (1939-45)." This failure is what led to the founding of the UN as its successor.