GMAT Sentence Correction (SC) | Re: RAGCT 2015 Day 22: Since 1868 approximately thirty five shipwrecks

Since 1868, approximately thirty-five shipwrecks have been recorded off Alaska, a region known fortheir treacherous seas—less than those recorded off the coast of Massachusetts.

A.their treacherous seas—less than that

B. its treacherous seas, a number fewer thanthat

C. its treacherous seas,which is less than those

D. its treacherous seas—fewer than have beencorrect

E.their treacherous seas, fewer than the ones
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