Sentence Correction (SC) | Re: Unlike the previous year’s bidding, the contract was awarded

Himikemcgarry ,chetan2u ,GMATNinja

I am a bit confused here. Doesn't the 1st part of the sentence need to be a complete logical sentence for option B to be correct?
I feel that the first part of the sentence cannot stand alone as a complete sentence.
Am I missing something?
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