GMAT Sentence Correction (SC) | Re: Critics of the young artist's alleges that his posthumous success

Critics of the youngartist's alleges that his posthumous success resulted less from appreciation of his artistic excellence and more from fascination with his untimely death at age 31.

(A) artist's allegesthat-- Wrong. SV error. "Alleges" is singular and doesn't agree in number with the subject which is "critics". Also artist not artist's

(B) artist's allege that -- Wrong. Artist not Artist's.
(C) artist alleges that --Wrong. SV error. "Alleges" is singular
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