In the given sentence we have the verbs "served" and "reformed" both conjugated in the Simple Past Tense.
In order to correctly complete the parallel structure we should use option C (led the rough riders up San Juan hill) where the verb "led" is also conjugated in Simple Past Tense.
The full sentence would be: "Before becoming president, Theodore Roosevelt served as deputy sheriff, reformed a police department, and led the rough riders up San Juan hill".
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