ANSWER: Both a and b
Explanation:
Three islands off Phuket in south Thailand were closed to tourists to protect endangered coral reefs.
- The tiny islands off Phuket's east coast, namely Koh Khai Nai, Khai Nok and Khai Nui, were shut down with all facilities and structures used for tourist activities since about 80 per cent of coral reefs in the area have been destroyed
