What is the main idea of the news item？A．Stricter security restrictions were imposed on lu

What is the main idea of the news item？

A．Stricter security restrictions were imposed on luggage.

B．Luggage delivery services offer travelers convenience.

C．New services caused a lot of trouble in checking luggage.

D．Airlines give travelers opportunities to fly first class.

请帮忙给出正确答案和分析，谢谢！

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