Based on the options provided in your question, here is how you can complete the sentences:
Indonesia has many ethnic groups, but the C Javanese make up the largest population. Another island nation, the Philippines, is also home to many ethnic groups, including the B Indian , who make up nearly a third of the population.
(Note: The second part regarding "Indian" in the context of the Philippines may refer to the presence of Indian communities, but the largest ethnic group in the Philippines is actually the Tagalog. If you were looking for a different group, you may want to consider that.)