PT79.S4.Q14 - psychology researchers observed that

olepueblo

Having trouble ruling out C.

Alex Short

If you're trying to strengthen a claim about what happens when parents sing to their children (they sound different, while trying to sound the same), it does little to our argument in knowing what happens when no child is present.

Compare that with D, which gives an explanation to the question of how the parents are, in fact, sounding different, thereby strengthening the conclusion.

inactive

Edited your title since you had the wrong section (Psych researchers LR is Section 4!)