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In the past few weeks, John, who is a teacher, has been arriving home late. When asked by Jane about this behavior, he muttered something about having lots of pressure at work. Jane has also noticed that he talks on his cellular phone in a hushed voice, but hangs up when she enters the room. Jane concluded that John must be leading a double life as a secret agent.
Which of the following, if true, most strongly supports Jane's conclusion?
This answer choice weakens Jane's conclusion. By introducing the reports of John's co-workers, it shows that John has indeed been at work for longer than usual, just as he told Jane.
This answer choice neither strengthens nor weakens Jane's conclusion. The argument deals with John's truthfulness to Jane and not the other way around.
This answer choice weakens Jane's conclusion by providing an alternative explanation to the occurences presented in the argument. Perhaps John has been secretive and late because he's been busy organizing a surprise party for Jane.
This answer choice strengthens Jane's conclusion by adding another piece of evidence that shows that John has been up to some international conspiracy.
This answer choice neither strengthens nor weakens Jane's conclusion. John could be busy either because he is a secret agent or for the same reason he told Jane - heavy work loads.