5. The correct answer is (D). The passage strongly suggests that motor vehicle traffic is
the primary cause of the congestion and noise that detract from enjoyment of the park,
which is what the park authorities are concerned with. Hence, prohibiting motorized
vehicles would clearly be the most effective way to abate the problem. Although the
courses of action that choices (B) and (E) propose would each be likely to reduce noise
and congestion caused by motorists, especially during peak tourism season, neither
would be as effective as an outright ban on motor vehicle traffic.
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