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What is the explanation?

Can anyone debrief..?
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What is the explanation?

Can anyone debrief..?

Diane claims that population in regions with harsh climate will decline and that in regions with moderate climate will rise, showing some reason X.

Paul claims that population in regions with moderate climate will decline and that in regions with harsh climate will rise. rise, showing some reason Y.

Thus the point of disagreement can be described as any of the following:
1. whether regions characterized by harsh climates are likely to experience population declines (option D). (Diane agrees, Paul disagrees)
2. whether regions characterized by harsh climates are likely to experience population rise. (Paul agrees, Diane disagrees)
3. whether regions characterized by moderate climates are likely to experience population declines. (Paul agrees, Diane disagrees)
4. whether regions characterized by moderate climates are likely to experience population rise. (Diane agrees, Paul disagrees)
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A is wrong b/c of "reason"
B is incorrect b/c of "overall population"
C is out b/c of "why older people"
E is loser b/c of "affordable places"
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I think this is a high-quality question and I agree with explanation.
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Why Option 1 is incorrect?

there is a disagreement on a reason stated for population shift...isn't it?
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Diane: As we both know, the population of this country is aging. Elderly people generally prefer not to live in harsh climates characterized by extreme temperatures. Accordingly, in this country's coastal regions, where the climate is generally most temperate, the population is likely to grow, while other regions are likely to suffer population declines. Paul: I disagree. With few exceptions, regions where the climate is harsh are characterized by comparatively low living costs, a compelling factor for retired people with little savings and on fixed incomes. Which of the following is the most likely point of disagreement between Diane and Paul?

A. the reason for the population shift toward coastal areas and away from other regions
B. whether the country's current decline in overall population will continue into the foreseeable future
C. why older people find certain regions where the climate is harsh attractive places to live
D. whether regions characterized by harsh climates are likely to experience population declines in the foreseeable future
E. the extent to which coastal regions are affordable places to live for retired people

My analysis:

Diane - Elder people do not prefer harsh conditions to live in. Coastal regions generally have optimum conditions. Hence elderly people may shift from the regions they currently live in to coastal regions. Thus, there will some regions (in which elderly people currently reside in ) whose population will decline, while other regions (coastal regions) whose populations will increase

Paul - Regions that have harsh climates generally have lower cost of living. Cost of living is one of the most important factor for elderly people.

We can infer that
1. Paul is trying to say that elderly people may stay in the existing regions, regions that have harsh climates, because of lower cost of living.
2. Paul - The variation in population as explained by Diane, wont be experienced

Option analysis: Option needs to be state a common fact that both disagree about. for example - Population decline in coastal region / population change among different regions /
A- Paul is directly contradicting the fact about population movement. He is trying to say that population movement may not occur. Hence, choice A is not relevant
B - The argument is inter-city and not inter-country. Hence wrong
C - Diane is stating that older people do not prefer to live in harsh climates. Hence, the question of preferring is out of context.
E - completely irrelevant
D - As per the statement made in option analysis. This is exactly what we had previously thought
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I think this is a high-quality question and the explanation isn't clear enough, please elaborate.
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KarishmaB bb , Why is option A incorrect here ?­ MartyMurray
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