Difficulty: Easy
Correct Answer: if only Assumption II is implicit
Explanation:
Introduction / Context:The recommendation compares modes on speed and presumes the alternative mode is actually available.
Concept / Approach:II is necessary: without ferries/boats, the advice is infeasible. I (remoteness) is not required; even if roads exist, boats could still be faster.
Final Answer:if only Assumption II is implicit
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