Mr Schmidt Has Some Children Acting a Bit Unusual in His

Mr. Schmidt has some children acting a bit unusual in his class. Which child is most likely in need of Mr. Schmidt taking action because the behavior is a serious cause for concern?

A) Kami, a four-year-old who tells fantasy stories as if they were true
B) Ben, a small boy who acts a bit immature in social settings
C) Stan, a two-year-old who flops himself on the ground and kicks when asked to share
D) Karen, a happy five-year-old who has recently become very aggressive and detached