Copenhagen is the capital and largest city of Denmark, located on the eastern coast of the island of Zealand. It is a cultural, economic, and governmental hub of Denmark. The city is known for its historical architecture, vibrant cultural scene, and being a center for innovation and sustainability. Copenhagen is also a major port city and a popular destination for tourists.

The smallest continent is Australia. Therefore, the correct answer is (A) Australia. Australia is both a country and a continent, and it is often referred to as the "smallest continent" due to its relatively small landmass compared to other continents.

The longest river in the world is the Nile. Therefore, the correct answer is (D) Neil (Nile). The Nile River is a major north-flowing river in northeastern Africa and is generally considered the longest river globally, with a length of approximately 6,650 kilometers (4,130 miles).

The statement "A living Vastu is born" was said by Woodrow Wilson, who was the President of the United States and a key advocate for the creation of the League of Nations. Therefore, the correct answer is:

(D) Wilson

The World Health Organization (WHO) was founded on April 7, 1948. The WHO's constitution was adopted by the International Health Conference in New York in 1946. The WHO is a United Nations specialized agency. 

The last session of the League of Nations occurred on April 18, 1946, during which the member states passed a resolution for the dissolution of the League. This marked the formal end of the League of Nations as an international organization. The dissolution was a result of the League's inability to prevent World War II and its diminished role in the post-war world order. The functions and responsibilities of the League were largely taken over by the newly established United Nations (UN).