a. Increased use of information technology is the correct answer.
Explanation:
Increased use of information technology is the greatest improvement in the service sector that could help facilitate world trade.
The service sector with the help of information technology has made a major contribution to Gross Domestic Product in most of the countries by giving employment, inputs and government service.
Information communications technology has played a major role by instantly generating millions of employment and also a major enabler of discovery and growth.
ICT means applied to businesses that have helped to streamline industry processes and increase efficiency.
