Which of the Following Is a Reason for the Evolution

Which of the following is a reason for the evolution of ecotourism?

A) to improve the quality of resource management and facility development/design
B) to try to preserve the environment and still gain the economic benefits of tourism
C) to expand the number of users that an area can accommodate before visitors cause a decline in the desirability of the area
D) to attract tourists based on material goods, daily life activities, and social expressions of culture