Assertion: The world trade pattern underwent a drastic change during the second half of the twentieth century.  

Reasoning: Europe lost its colonies while India, China and other developing countries started competing with developed countries in the second half of 20th Century.

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

The correct answer is Option 1: Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

Assertion: The world trade pattern underwent a drastic change during the second half of the twentieth century. This is true. The second half of the twentieth century witnessed major changes in global trade. Many colonies became independent nations, new industrial economies emerged, and international trade expanded beyond the traditional dominance of European colonial powers.

Reasoning: Europe lost its colonies while India, China and other developing countries started competing with developed countries in the second half of 20th Century. This is also true.

How the Reason explains the Assertion: The loss of colonies by European countries and the emergence of developing countries as important participants in world trade were major factors behind the drastic changes in the global trade pattern. Thus, the Reason directly explains the Assertion.

NCERT: The world trade pattern underwent a drastic change during the second half of the twentieth century. Europe lost its colonies while India, China and other developing countries started competing with developed countries. The nature of the goods traded has also changed.