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Radon-210 is more radioactive than Technetium-99. Since Promethium-61 is more radioactive than Protactinium-234, it follows that Radon-210 is more radioactive than Protactinium-234.
Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
(A) Technetium-99 is more radioactive than Promethium-61.
(B) Promethium-61 and Technetium-99 have equal levels of radioactivity.
(C) Promethium-61 and Radon-210 have equal levels of radioactivity.
(D) Promethium-61 is more radioactive than Radon-210.
(E) Technetium-99 is more radioactive than Protactinium-234.
Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
(A) Technetium-99 is more radioactive than Promethium-61.
(B) Promethium-61 and Technetium-99 have equal levels of radioactivity.
(C) Promethium-61 and Radon-210 have equal levels of radioactivity.
(D) Promethium-61 is more radioactive than Radon-210.
(E) Technetium-99 is more radioactive than Protactinium-234.
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(D) in my opinion.
Given: 210 > 99 && 61 > 234
Conclusion: 210 > 234.
There is a disconnect between the two. If we can somehow bridge the disconnect between the 210 and 234, we will get to our answer. We need to find an answer that doesn't do that.
(A) Technetium-99 is more radioactive than Promethium-61.
If 99>61, then 210 will be > 234.
(B) Promethium-61 and Technetium-99 have equal levels of radioactivity.
If 61 = 99. And 210 > 99 and 61 (or 99) > 234, then 210 will be > 234.
(C) Promethium-61 and Radon-210 have equal levels of radioactivity.
If 61 = 210, and 61 is > 234, then 210 will be > 234.
(D) Promethium-61 is more radioactive than Radon-210.
If 61 > 210. Then it might be that 234 is greater than or equal to or less than 210. You can not logically deduce the relationship between them on the basis of the given information. Hence, the correct answer choice. Correct.
(E) Technetium-99 is more radioactive than Protactinium-234.
If 99 > 234, and it's given that 210 > 99, then 210 will be > 234.
Given: 210 > 99 && 61 > 234
Conclusion: 210 > 234.
There is a disconnect between the two. If we can somehow bridge the disconnect between the 210 and 234, we will get to our answer. We need to find an answer that doesn't do that.
(A) Technetium-99 is more radioactive than Promethium-61.
If 99>61, then 210 will be > 234.
(B) Promethium-61 and Technetium-99 have equal levels of radioactivity.
If 61 = 99. And 210 > 99 and 61 (or 99) > 234, then 210 will be > 234.
(C) Promethium-61 and Radon-210 have equal levels of radioactivity.
If 61 = 210, and 61 is > 234, then 210 will be > 234.
(D) Promethium-61 is more radioactive than Radon-210.
If 61 > 210. Then it might be that 234 is greater than or equal to or less than 210. You can not logically deduce the relationship between them on the basis of the given information. Hence, the correct answer choice. Correct.
(E) Technetium-99 is more radioactive than Protactinium-234.
If 99 > 234, and it's given that 210 > 99, then 210 will be > 234.
