SAT Question e7dc27dc: Command Of Evidence answer and explanation

English - Command Of Evidence - Hypothetical Finding Supports
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As a monthly newsletter formed in 1969 by a group of Asian American students at the University of California, Los Angeles, Gidra helped raise awareness about social and political issues concerning the Asian American community on campus and at large. The newsletter had an expansive reach for a publication of its kind: around 4,000 copies were published each month. A student writing a history paper, however, hypothesizes that Gidra’s influence cannot be measured by the number of newsletters published monthly alone.
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Difficulty:Medium
Which finding, if true, would most directly support the student’s hypothesis?