SAT Question dc645172: Form Structure And Sense answer and explanation

English - Form Structure And Sense - Subject Verb Agreement
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The artistic talents of Barbara Chase-Riboud, most known for her 1979 historical novel Sally Hemings and the conversation it inspired, ______ limited to the realm of prose: she first excelled in sculpture, where her affinity for bronze—a material she described as “timeless” due to its use across eras and cultures—became part of her artistic identity.
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Difficulty:Hard
Which choice completes the text so that it conforms to the conventions of Standard English?