The central idea of the passage is "Trujillo was a dictator whose cruelty knew no bounds." (Option A).
The central idea of a text is the topic which is supported by other elements of the text and or the story.
In this case, the central idea about Trujillo being cruel is stated in the opening sentence and supported by the other sentences.
Hence, it is correct to state that the central idea of the passage is "Trujillo was a dictator whose cruelty knew no bounds."
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