The Ekiti Parapo was a coalition of Ekiti towns in the 19th century Yoruba land. The primary aim of the Ekiti Parapo was to check the expansionist agenda of the Ibadan empire, which was seeking to conquer and dominate the smaller kingdoms in the region.
Therefore, the correct option is "reducing the powers of Ibadan." The Ekiti Parapo was not formed to check European inroads into Yorubaland, restore the dignity of the Alaafin, or form a federated government.