SAT Question 9127635a: Form Structure And Sense answer and explanation

English - Form Structure And Sense - Finite And Nonfinite Verb Forms
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Star actress Kiki Omeili, who has appeared in 47 Nollywood films, is one of numerous luminaries to be pictured in Nigerian portraitist Iké Udé’s exhibition Nollywood Portraits. ______ referred to Nollywood—Nigeria’s \$3 billion film industry—as “Africa’s vivid mirror par excellence,” honors its legacy with his vivid classical portraits of Omeili and her peers.
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Difficulty:Hard
Which choice completes the text so that it conforms to the conventions of Standard English?