Children Learn to Suppress Their Emotions and Display Them with a More

Children learn to suppress their emotions and display them with a more appropriate emotion according to societal rules.What have researchers found concerning the development of this behaviour?

A) There is limited ability to disguise true feelings by as early as 3 years of age.
B) Boys are more skilled at complying with display rules.
C) Only children in communal societies are motivated by a desire to maintain social harmony.
D) Even preschoolers are particularly skilled at convincing others that their lies are true.