by giladedelman Tue Aug 10, 2010 4:18 pm
Thanks for the question!
Answer (E) is incorrect mainly because we have no basis to say that skill at adapting is roughly proportional to the level of development of the prefrontal cortex. The stimulus tells us that the cortex is essential for this skill, but it's a big leap from there to say that, for example, as the cortex develops 10%, skills also develop around 10%.
The other problem with (E) is that the stimulus deals specifically with new rules, while this answer choice refers to new situations.
Now, why is (C) correct? Well, the researchers suggest that the toddlers' failure to follow the new rules was due to some extent to insufficient development of the prefrontal cortex. If it's due to insufficient brain development, it's a very small leap to infer that certain toddler behavior may not be willfully disobedient. In other words, they were breaking the new rules not on purpose, but because their brains weren't developed enough to make sense of them.
(A) is out of scope. We have no basis for comparing one set of toddlers to another.
(B) is too extreme. We don't know that "only" adolescents and adults can adapt to new rules.
(D) is way out of scope. More important than upbringing?
So, does that answer your question? Do you see why (C) is correct and (E) is incorrect? Let me know if this one is still bugging you.
#officialexplanation