SAT Question 1b219d14: Transitions answer and explanation

English - Transitions - Addition Or Continuation
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As a young historian in the 1950s, Alixa Naff began interviewing fellow Arab American immigrants about their experiences straddling two cultures. Over the next few decades, Naff conducted more than 450 such interviews, also known as oral histories. ______ she collected photographs and other artifacts that represented her subjects’ experiences.
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Difficulty:Easy
Which choice completes the text with the most logical transition?