In One Experiment,children Were Asked to "Argue" with a Puppet

In one experiment,children were asked to "argue" with a puppet by transforming all the puppet's statements into negative forms.What were the results of this experiment?

A) Children did not use negative auxiliaries correctly until the elementary-school years.
B) Preschoolers could convey nonexistence but not denial or rejection.
C) Most preschoolers were capable of using a wide variety of negative auxiliaries.
D) Preschoolers could convey denial or rejection but not nonexistence.