The correct answer matches each island with the correct number on the map. In the correct answer, option 4, A corresponds to 3 which stands for Seychelles, B corresponds to 1 which stands for Chagos, C corresponds to 4 which stands for Mauritius, and D corresponds to 2 which stands for Socatra.
Option 1 is incorrect as it matches Seychelles with 1, Chagos with 3, Mauritius with 4 and Socatra with 2.
Option 2 incorrectly matches Seychelles with 3, Chagos with 1, Mauritius with 2 and Socatra with 4.
Option 3 is also incorrect as it assigns Seychelles to 1, Chagos to 3, Mauritius to 2 and Socatra to 4.
In summary, only option 4 correctly maps each lettered item (island) to the appropriate labelled number on the map.