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Verbal·Standard English Conventions·Boundaries
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A 2012 study led by        studied the impacts of fertilizers containing nitrogen in a plant population. Another study led by Kimberly La Pierre in 2015 looked at fertilizers and two other nutrients: phosphorus and potassium.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
ecologist, Alex K. Dittrich
B
ecologist Alex K. Dittrich,
C
ecologist Alex K. Dittrich
D
ecologist, Alex K. Dittrich,