GMAT Sentence Correction (SC) | Only seven people this century have been killed by the great

Only seven people this century have been killed by the great white shark, the man-eater of the movies−less than those killed by bee stings.

A. movies−less than those
B. movies−fewer than have been
C. movies, which is less than those
D. movies, a number lower than the people
E. movies, fewer thanthe ones

GMATNinja Could you help to analyze answers (B) & (E)? What is "the ones quot; in (E) referring to? Does the verb tense have to be in parallel " have been killed by X...have
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