The correct answer is option 2: Mauritius.

Mauritius is an island nation located in the Indian Ocean. Recently, it declared a state of environmental emergency due to an oil spill caused by a grounded ship. The ship, named MV Wakashio, ran aground on a coral reef off the coast of Mauritius on July 25, 2020. This led to a major oil spill in the region, which has had severe consequences for the local marine ecosystem. The spill has caused significant damage to coral reefs, mangroves, and marine life, and has also affected the livelihood of the local population, who rely heavily on fishing and tourism. The government of Mauritius declared a state of emergency in response to this environmental disaster and has been working to contain and mitigate the impact of the oil spill. The incident has also raised concerns about the need for better maritime safety and environmental protection measures in the region.