Answer: C. Sixteen-year-olds will be able to do this, but 8-year-olds will be unable to do this
Explanation:
From the study it could be likely deduced that the sixteen-year-olds will be able to due it based on the argumentative skills they have acquired through years of studies.
This may not be true of the younger children- the 8-year-olds who may not have developed such skills due to their age