The headquarters of the World Bank is in Washington D.C. United States of America (USA).

Africa is known as the "Dark Continent" because it was unexplored for a long time. The term was coined by Welsh journalist and explorer Henry Morton Stanley in his 1878 travelogue. Stanley considered Africa to be mysterious and poorly known. 

The Pacific Ocean is almost triangular in shape. It's not perfectly round, but it appears circular when viewed on maps and globes. The Pacific Ocean's apex is in the north at the Bering Strait. 

The Chinese government pledged US$40 billion for the creation of the investment fund established on 29 December 2014.

(A) Species that are found only in some particular areas

Endemic species are those that are native and restricted to specific geographical areas and are not naturally found anywhere else in the world. They have evolved and adapted to particular local conditions, making them unique to those specific regions.

The Strait of Gibraltar connects the Atlantic Ocean with the Mediterranean Sea and separates Spain on the European continent from Morocco on the African continent.

The world's longest river, the Nile, flows through the continent of Africa. It is approximately 6,650 kilometers (4,130 miles) long and is a significant geographical feature in northeastern Africa. Therefore, the correct answer is (B) Africa.

The three largest sovereign countries by surface area are Russia, Canada, and the United States. Together they occupy roughly a quarter of Earth's landmass. Other heavyweights in size are China, Brazil, Australia, India, Argentina and Kazakhstan.