Tricky question, the way I see the situation is as an experiment. For it to be valid, there must be a substantial amount of control group, which are those who wear seat belts. Option A provided this, however, another question would be the amount of control group i.e seat belt wearers needed to make the experiment valid. Yet, option A is good enough i.e over 0.2 meaning less than .64 are not wearing seat belts. Open for discussion.
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