15. All of the following are grammatically accurate EXCEPT which one?
(A) Writers, artists, and singers often meet in the coffeehouses of New York City’s Greenwich Village, wherethey can present their work to a small but influential public.
(B) Calcium, the most abundant mineral in the body, works with phosphorus in maintaining bones and teeth.
(C) The situation comedy has proved to a remarkably durable commercial television format.
(D) Soil science began with the formulation of the theory of humus in 1809.

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