I believe it's because in the first independent  clause, college is 
functioning as the object of the prepositional phrase.   In choice B, its as the 
pronoun for college is functioning as the direct  object.  They are not parallel 
structures.
 
"I may not have gone where I intended to go, but I think I  have ended up 
where I needed to be. " 
~ Kahlil Douglas  Adams

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