The correct answer is option 4 - the Cabinet of a country held the underwater meeting to highlight the threat of rising sea level for the country. This option reflects the concept of a government body discussing an issue related to the sea and its potential consequences for the country. The phrase "highlight the threat of rising sea level" suggests that the underwater meeting was organized to bring attention to the impact of rising sea levels, indicating a governmental focus on addressing this issue.

Option 1 is incorrect as it suggests that the meeting was organized by Somali pirates to plan ship captures for ransom. This answer does not align with the purpose of highlighting a threat to a country or promoting environmental awareness.

Option 2 is not the correct answer as it implies that the meeting was organized by environmental scientists to raise awareness about saving water. While saving water is important, it is not directly related to the threat of rising sea levels.

Option 3 is also incorrect as it states that the meeting was organized by environmental activists to raise awareness against air pollution. Again, this answer does not connect to the topic of rising sea levels and the purpose of the underwater meeting.

In summary, option 4 is the correct answer as it accurately reflects the purpose of the underwater meeting, which was to draw attention to the threat of