As the question stem says to weaken the conclusion, which is it should be each person's decision whether or not to wear a seat belt. So, to weaken it the option we can say it is not upto the driver or passengers to decide whether they wear seat belt or not. And A exactly says that.
I am able to comprehend B also and I agree that it is harming others. But the question stem is saying to weaken the conclusion and not the argument as a whole.
I am able to comprehend B also and I agree that it is harming others. But the question stem is saying to weaken the conclusion and not the argument as a whole.
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