A、They were frightened. B、They were very angry. C、They could not give any proof. D、They could not speak English. D

A motorist saw two men walking along a lonely country road.  They were carrying heavy bags, so he at once informed the police. That morning the police had broadcast a message on the radio asking for information which might lead to the arrest of two thieves who had stopped a train and stolen mail-bags containing a lot of money. The police soon arrived on the scene.  They questioned both men, but neither of them could speak English. The men tried hard to resist arrest and kept shouting loudly at the police all the way to the station. When they arrived, both men refused to say anything and simply pointed at their bags.  The police opened them at once and then realized that they had made a terrible mistake. The men were French onion-sellers and their bags were full of onions! Apologizing for their mistake, the police set the men free immediately.