North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the earth's land area and about 4.8% of its total surface. North America is the third largest continent by area, following Asia and Africa, and the fourth by population after Asia, Africa, and Europe.

The correct answer is option 'D' - North America. Here is an explanation of why North America is the third largest continent in the world.

Geographical Size:
- North America is the third largest continent in terms of geographical area, after Asia and Africa.
- It covers an area of approximately 24.7 million square kilometers.
- North America is located in the Northern Hemisphere and is bordered by the Atlantic Ocean to the east, the Pacific Ocean to the west, the Arctic Ocean to the north, and South America to the south.

Landmass:
- North America consists of several countries including the United States, Canada, Mexico, and various Caribbean nations.
- It is primarily made up of two large landmasses: the North American Plate and the Caribbean Plate.
- The North American Plate includes the mainland territories of the United States and Canada, while the Caribbean Plate consists of the Caribbean islands and the surrounding waters.

Physical Features:
- North America is characterized by diverse physical features, including vast plains, rugged mountains, extensive river systems, and numerous lakes.
- The continent is home to the Rocky Mountains, the Appalachian Mountains, the Great Lakes, and the Mississippi River, among other notable features.
- It also includes the Great Plains, which stretch across the central part of the continent and are known for their fertile soils and agricultural productivity.

Population and Economy:
- North America has a significant population, with over 580 million people residing in the continent.
- The United States is the most populous country in North America, followed by Mexico and Canada.
- The continent is known for its highly developed economies, with the United States being the largest economy in the world.
- North America is rich in natural resources, including oil, gas, minerals, and timber, which contribute to its economic strength.

Cultural Diversity:
- North America is culturally diverse, with a blend of indigenous cultures, European influences, and various immigrant communities.
- The continent has a rich history and heritage, shaped by the interactions of different cultures over centuries.
- It is home to numerous indigenous tribes, such as the Native Americans and Inuit, who have inhabited the region for thousands of years.

In conclusion, North America is the third largest continent in the world, both in terms of geographical size and population. It is known for its diverse physical features, thriving economies, and cultural richness.

The biggest of them all is Asia.It spans 17,139,445 square miles - 29.1percent of earth total land mass- and as a population of 4.1 villian people.
The other commonly recognized continents are Africa,Europe, North America, South America, Antarctica and Australia.