GMAT Critical Reasoning (CR) | Re: Sam: During recessions, unemployment typically rises.

Sam is saying Due to more unemployment, car usage would be more. As the question talks about what Sam is assuming, we don't even need to look for someone else.

So, if he is saying cars won't be used , he is assuming that people who got free will not go for outing with friends/families or other reasons.

Only option that talks about this is D. Hence, the correct answer.

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