According to Projections by the United Nations' World Tourism Organisation

According to projections by the United Nations' World Tourism Organisation (UNWTO) , as noted in their Tourism 2020 Vision, travel and tourism will become the world's largest industry in the twenty-first century.What did the UNWTO forecast will be the level of international arrivals by the year 2020?

A) 1.6 billion international arrivals
B) 1.4 billion international arrivals
C) 1.8 billion international arrivals
D) 2.0 billion international arrivals