Read the sentences.Some scientists are for a manned mission to Mars. Some scientists are against a manned mission to Mars. There is a lot for people to think about.

Choice B combines the repeated ideas into one concise sentence: scientists have expressed both pros and cons, and people have factors to consider. It preserves the meaning without repeating the same wording. Choice A is also similar, but “People should think about it” is less specific than the original idea that there is a lot to think about.

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