Which of the following establishes links between producing centres and consuming centres ?

All of the above

The correct answer is Option 4: All of the above

The movement of goods from places where they are produced to places where they are consumed depends on the combined role of transport, communication, and trade:

• Transport moves goods and people from one place to another.
• Communication helps in the exchange of information between producers, traders, and consumers.
• Trade involves the buying and selling of goods and services, linking producers with consumers.

Together, these activities establish and maintain links between producing centres and consuming centres.