SAT Question be34a3df: Boundaries answer and explanation

English - Boundaries - No Punctuation Within Clause
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In 2008, two years after the death of science fiction writer Octavia Butler, the Huntington Library in ______ received a collection of more than 8,000 items, including Butler’s private notes, research materials, manuscripts, photos, and drawings. Today, the Octavia E. Butler Collection is one of the most researched archives at the library.
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Difficulty:Medium
Which choice completes the text so that it conforms to the conventions of Standard English?