GMAT Sentence Correction (SC) | Re: Though now eaten in large quantities around the world and

Though now eaten in large quantities around the world and harmless, the tomato is a member of the generally toxic nightshade family, including belladonna, and was once thought to be poisonous itself as a result.
Major problem is parallelism betweeneaten in large quantities around the world and harmless in A, B, C & E
SO D is answer

Apart from this C & E has meaning issue
C fails to show the contrast by removingthough
D conveys the contrast the other way around even though it is harmless
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