According to the principal secretary in Gulliver's Travels, the Lilliputians faced invasion by a rival nation and a violent group within the nation, as options A and C show.
According to Reldresal, principal secretary in Gulliver's Travels, the Lilliputians faced two problems. The first problem was the Tramecksan, a violent rebel group that was harming the Lilliputians. The second problem was the invasion of a foreign and powerful enemy.
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