GMAT Sentence Correction (SC) | A report recently released by the Public Safety Commission

A report recently released by the Public Safety Commission confirms that the proliferation of handguns among minors, which was noticed five years ago, still continues andthat measures enacted at that time to control the proliferation have had only minimal effect .

A)that measures enacted at that time to control the proliferation have had only minimal effect
B) that measures enacted to control it at that time only have had minimal effect
C) that measures enacted to control it at that time have
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