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premise: settlers planted special variety of sunflower 10000 yr ago. all sunflower on island are from that variety.
conclusion: by studying today's variety, we can know about that orginal variety.
evidence: the wild plants have not been selectively cultivated over the years as the farmed plants have.

Pre-thinking: what if selectively not cultivated, then we would have lost the original variety some where in between. now that we have cultivated then properties of orginal one are carried on in current variety.

B. The wild sunflower plants on the island of Tropica today are more similar to the original variety than today’s farmed plants. --- what if this is not true. what good it will bring by studying these plants. we will know nothing about orginal variety. straight thi is the right answer.

D. The selective cultivation of farmed plants over the past 10,000 years has led to few if any significant changes from the original variety. --- even if few changes we can know about the original variety. what if we negate it. conclusion is as it is. this can't be the answer.
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Quote:
Botanist: On the remote island of Tropica, it is known that early settlers brought a special variety of sunflower plant to cultivate on their arrival over 10,000 years ago. All of the sunflowers on the island today, both wild and farmed, have descended from that original variety. By studying today’s wild sunflower plants on the island of Tropica, we can learn much more about that original variety of sunflower because the wild plants have not been selectively cultivated over the years as the farmed plants have.


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(C) The climate on the island of Tropica has not changed significantly over the past 10,000 years.

My logic was. - If the climate did change significantly, then my conclusion, i.e. - we can learn a lot about original variety based on Wild Cultivation, which doesn't have any special cultivation associated with it - falls apart and hence I chose C.
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Isn't option B kinda sufficient statement? In assumption we look for necessary statement.
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anshumanmalliwal
Isn't option B kinda sufficient statement? In assumption we look for necessary statement.
anshumanmalliwal In assumption questions that require necessary assumptions, assumptions can be BOTH necessary AND sufficient – they don't have to be one or the other.
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