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assumption question doubt

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Intern
Joined: 18 May 2016
Posts: 3
Concentration: Finance, General Management

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11 Apr 2017, 06:34
Argument: Investments that are not subject to market risk are categorised as conservative investment options. These options are generally safe to invest in but generate a lower than average market-yield. Therefore, some people over 60 are likely to get returns that are lower than the market average.
Which of the following is an assumption made by the author?
A. Most people over 60 are likely to invest in conservative investment options.
B. At least one person over 60 is likely to invest in conservative investment options.
C. Some investors over 60 are likely to invest in options other than the ones generally considered conservative.
correct answer is B .But I havent understood the explanation of B .pl explain
this is the explanation
Rephrase of the negated statement: 0-99 fields of study that employ scientific methods are genuine scientific enterprises.
Meaning of the negated statement: If you see, the above statement says that out of a 100 possibilities, 0-99 employ scientific methods and are genuine scientific enterprises. This means that there is definitely one possibility that a field employs scientific methods but is still not a genuine scientific enterprise.
Impact on the conclusion: The negated version of Choice B completely destroys the basis of the author’s conclusion. The reason the author said that parapsychology is a genuine scientific enterprise was that it uses scientific methods to examine the question it raises, implying that this factor is sufficient. However, the negated version says that it is not sufficient as there is definitely 1 possibility in which even a field that uses scientific methods is not a genuine scientific enterprise. Hence, the conclusion is falsified. It is indeed the correct answer! but my doubt is if we go for extreme cases in option B one condition will weaken and other will strengthen option then how can we select option as B
assumption question doubt   [#permalink] 11 Apr 2017, 06:34
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