SAT Question 56770dda: Form Structure And Sense answer and explanation

English - Form Structure And Sense - Verb Tense Consistency
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In his 1963 exhibition Exposition of Music—Electronic Television, Korean American artist Nam June Paik showed how television images could be manipulated to express an artist’s perspective. Today, Paik ______ considered the first video artist.
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Difficulty:Easy
Which choice completes the text so that it conforms to the conventions of Standard English?