The Forum is an excellent opportunity for us to meet and exchange views, to establish partnerships, to share good experiences and to learn from each other. It is also a wonderful source of inspiration for policy-makers to get the “feeling” of what he could do better to help tourism thrive. It is finally an occasion to raise the visibility of tourism as a major economic and social development factor for Europe and its regions. Choose from the following choices those that can help build the information structure of the paragraph.(    )
A、opportunity
B、policy-makers
C、development factor
D、regions