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GMAT - Sentence Correction - Sentence Correction

Recently discovered fossil remains strongly suggest that the Australian egg-laying mammals of today are a branch of the main stem of mammalian evolution rather than developing independently from a common ancestor of mammals more than 220 million years ago

Recently discovered fossil remains strongly suggest that the Australian egg-laying mammals of today are a branch of the main stem of mammalian evolution rather than developing independently from a common ancestor of mammals more than 220 million years ago.

(A) rather than developing independently from
(B) rather than a type that developed independently from
(C) rather than a type whose developments was independent of
(D) instead of developing independently from
(E) instead of a development that was independent of

 

The two splits here are rather and instead. Rather is more appropriate to use in this text. Instead means an alternative and in the context of the sentence, it is not an alternative being referred to. Hence we eliminate answer choices D and E. Answer choice C is wordy. Answer choice B is correct as it clearly conveys the distinction and uses the word 'type' to make the text more specific.