The main idea of this passage is D. terrorism can lead to significant emotional pain long after the event.
<h3>What is the main idea?</h3>
The main idea is the most central or important issue in a paragraph or passage.
The main idea states the purpose of the passage and sets its direction for further discussion.
Without the main idea, the readers or audience would not understand the purpose of the speaker or writer.
Thus, the main idea of this passage is D. terrorism can lead to significant emotional pain long after the event.
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The difference between a compound sentence and complex sentence is that a compound sentence has two independent clauses (clauses that could stand alone) and a complex sentence has one independent clause and one dependent clause.