GMAT Sentence Correction (SC) | Re: Starfish, with anywhere from five to eight arms, have a

Hi,

Is it possible to eliminate option (A) because of ambiguous antecedents as there are two "IT" and each of them could refer to Starfish or Arm?
In option (B) though "IT" should logically refer to one arm, it may also refer to starfish. Is the use of "IT" right in option B?