Final answer:
Stanley's promises at the Berlin Conference intrigued Leopold, but they were lies. Leopold ruled the Congo Free State for personal enrichment, allowing Europeans to exploit African labor.
Step-by-step explanation:
Stanley's statements that intrigue Leopold are the promises he made at the Berlin Conference in 1884. Stanley claimed that he would impose no tariffs on the colony's imports and had in mind only the benefit of the Congolese natives. However, these statements were lies, and Leopold ruled the Congo Free State entirely for his personal enrichment, allowing Europeans to exploit and abuse African laborers.