The functions of children's friendship that Johnny is most likely describing is C.) stimulation and ego support.
According to the functions of children's friendships, stimulation is such a function in which your friend influences you to come up with better ideas and better innovation.
Ego support is a function of children's friendship in which a friend protects your ego and makes you feel better when you fail.
In the question above, Andy encourages Johnny to do better which is the stimulation function of children's friendship. She also comforts Johnny when he fails and this is the ego support function of the children's friendship functions.
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