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Shadyshades

I couldn't find any error in MEANING in option B. Is there any ? I don't see any error to use "believed to have been genetic, originally" as people believe (today) that the afflictions were genetic in origin. Perhaps, A is more concise than B ?
Please correct me if I am wrong.
We do not use the present perfect for states that could never be different.
So we do not say iron has been a metal or iron is believed to have been a metal. We can say iron is a metal or iron is believed to be a metal.

Similarly, it does not make sense to say that a disease has been genetic or that a disease is believed to have been genetic.
Because the quality of being genetic can never change. Any disease has either been genetic always or it has never been genetic.

We CAN say that a disease has been common or that a disease is believed to have been common.
Because that CAN change: perhaps the disease was common in the past, or perhaps the disease has been common for many years now, or perhaps we believe that the disease was common at some points in history.

Hope this makes sense?

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Shadyshades
carcass yashikaaggarwal vv65 GMATNinja

I couldn't find any error in MEANING in option B. Is there any ? I don't see any error to use "believed to have been genetic, originally" as people believe (today) that the afflictions were genetic in origin. Perhaps, A is more concise than B ?
Please correct me if I am wrong.
You can solve it using parallelism too.

to be X in non-underlined sentence needs to put parallel to be Y in underlined.
B doesn't have that.
You can eliminate B like that.

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