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
B in mountain ranges where Oecophylla ants were present above the base
C in mountain ranges where Oecophylla ants were present at the base
D in mountain ranges where Oecophylla ants were present onto the base
E no correction required
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