SAT Question 0fe5ce68: Form Structure And Sense answer and explanation

English - Form Structure And Sense - Subject Verb Agreement
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Ten of William Shakespeare’s plays are classified as histories. Although each one of these plays, which include Henry V and Richard III, ______ on a single historical figure (specifically, an English king), some, such as Henry VI Part One and Henry VI Part Two, feature different episodes from the same monarch’s life.
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Difficulty:Hard
Which choice completes the text so that it conforms to the conventions of Standard English?