As per World Development Report 2008 of the World Bank, arrange the following countries according to the size of their economy in descending order. State which one of the following is the correct order ?

The correct answer is (a).

According to the World Development Report 2008 of the World Bank, the size of the economy of a country is measured by its gross domestic product (GDP). In 2008, the GDP of China was $3.2 trillion, the GDP of the USA was $14.7 trillion, the GDP of the UK was $2.2 trillion, and the GDP of India was $1.2 trillion. Therefore, the size of the economy of China is greater than the size of the economy of the USA, which is greater than the size of the economy of the UK, which is greater than the size of the economy of India.

Option (b) is incorrect because the GDP of the UK is not greater than the GDP of China.

Option (c) is incorrect because the GDP of the USA is not greater than the GDP of China.

Option (d) is incorrect because the GDP of China is not greater than the GDP of the UK.