Final answer:
Indonesia has the most islands among the listed countries.
Explanation:
Indonesia has the most islands among the listed countries, with more than 17,500 islands in its archipelago. This makes Indonesia the world's largest archipelago state, covering a vast expanse of islands.
The Philippines and East Timor also consist of numerous islands, but Indonesia surpasses them in the sheer number of islands.
Given its large number of islands, Indonesia stands out as the country with the most islands compared to the others listed.
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