SAT Question 0a114526: Boundaries answer and explanation

English - Boundaries - No Punctuation Within Clause
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In 1937, Chinese American screen actor Anna May Wong, who had portrayed numerous villains and secondary characters but never a heroine, finally got a starring role in Paramount Pictures’ Daughter of Shanghai, a film that ______ “expanded the range of possibilities for Asian images on screen.”
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Difficulty:Hard
Which choice completes the text so that it conforms to the conventions of Standard English?