To determine if a change is needed to the underlined text "a trail that goes on for," we need to assess how well it conveys the intended meaning and clarity of the sentence.
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"a trail that goes on for" – This phrase is somewhat vague. It suggests duration but doesn't specify what the trail goes on for (e.g., distance, time).
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"a trail that extends" – This is a clearer expression of the trail's length or reach without implying a specific duration.
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"a very long trail that takes" – This implies not only length but also suggests a time associated with traveling the trail, which might not be necessary.
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"an extensive trail that extends" – This also suggests length and includes "extends," which implies a long stretch, making it clear.
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"No change" – This would mean keeping the original wording.
Considering clarity and conciseness, the suggested change of "a trail that extends" (option M) provides a clearer description without unnecessary details.
Thus, if a change is wanted, option M is the most effective. If clarity and conciseness are priorities, option R is also a good choice.
Final recommendation: M. a trail that extends.