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    Question

    The findings revealed a striking pattern: in mountain

    ranges where Oecophylla ants were present on the base , insect-eating bird species diversity peaked at mid-elevations, around 960 meters. In each question below, a sentence is given with a part of it printed in bold type. That part may contain a grammatical error. Each sentence is followed by phrases 1), 2), 3) and 4). Find out which phrase should replace the phrase given in bold to correct the error, if there is any, and to make the sentence grammatically meaningful and correct. If the sentence is correct as it is and ‘ No correction is required’, mark 5) as the answer.
    A in mountain ranges where Oecophylla ants were present in the base Correct Answer Incorrect Answer
    B in mountain ranges where Oecophylla ants were present above the base Correct Answer Incorrect Answer
    C in mountain ranges where Oecophylla ants were present at the base Correct Answer Incorrect Answer
    D in mountain ranges where Oecophylla ants were present onto the base Correct Answer Incorrect Answer
    E no correction required Correct Answer Incorrect Answer

    Solution

    The preposition "at" is the correct choice to indicate a specific location, in this case, "at the base" of the mountain. The other options use incorrect prepositions or locations that don't fit the intended meaning. Therefore, option 3 is the most appropriate.

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