The correct answer is A, Indonesia.
Indonesia is an island country located between Southeast Asia and Oceania. It includes 17,508 islands and according to statistics for 2015 it has more than 255 million people, making it the fourth most populous country in the world.
The Republic of the Philippines is made up of 7,107 islands, which are classified geographically into three groups: the island of Luzon, the group of the Visayas and the island of Mindanao.
Singapore is a sovereign country of Asia, consisting of sixty-three islands.
East Timor is a country in Southeast Asia. Its territory comprises the eastern half of the island of Timor, the nearby islands of Atauro and Jaco and the exclave of Oecusse, surrounded by territory of the Indonesian region of West Timor.
