Question on one of CR problem

[SamuelK331]

Not sure whether I can post this here but...

Q: Scientist often study modern-day primates in an attempt to better understand the behavior and lifestyle of their now-extinct primate ancestors. This is a questionable technique, however, as primate groups have not always been exposed to the same types of external stimuli. Most primates now being observed have been seriously impacted by the loss of their former habitat due to deforestation.

which of the following, if true, most seriously undermines the argument above?

A) By studying the response of a primate group to any external factors, scientists can better predict how other primates would respond to different stimuli.
B) Out of scope
C) Out of scope
D) Out of scope
E) Even those modern-day primates groups that have not been affected by habitat loss are still thought to be quiet different from extinct primate groups .

When you look at this one, answer is A. However, my question pertains to answer E.

Conclusion = "This is a questionable technique"
Premise that supports Conclusion = "as primate groups have not always been exposed to the same types of external stimuli"

When you look at answer E, answer strengthens the author's argument. (modern day primates are different from extinct (no correlation) >>> supports >>>> questionable technique.

EVEN THOUGH both are same side (in regards to argument), premise that conclusion of argument is using and that of answer is completely different.

Conclusion of argument = Questionable b/c not have been exposed to same external stimuli.

Answer E = quiet different (supports "questionable technique") but premise states "EVEN THOUGH modern-day primates are NOT affected by habitat loss = EVEN THOUGH THEY ARE EXPOSED TO SAME EXTERNAL STIMULI."

So, Answer E completely erases the premise used by conclusion but FURTHER STRENGTHENS the conclusion.

At the end of the day, conclusion is strengthened but IS IT OKAY TO COMPLETELY CHANGE/REVERSE/KILL premises of argument's conclusion?

Please let me know.

Thanks!

[RonPurewal]

Not sure whether I can post this here but...

...well, i'm not sure either.
(:

let's find out.

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