According to the passage on transportation, the world witnessed a significant acceleration in the movement of people, goods and information after the second half of the twentieth century. Which of the following are the reasons for this? Choose the correct answer from the options given below:

1.Liberalized trade.

2.Emergence of economic blocs.

3.Low labour productivity.

4.Efficient use of resources.

A1 and 2 only

B1, 2 and 4 only

C1, 2 and 3 only

D3 and 4 only

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