Sam has recently begun to display the emotion of anger.Sam is MOST likely:

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Anger is considered a secondary emotion and usually develops around 6 months old when infants begin to have more complex emotions and social interactions. At 3 weeks, infants are still primarily focused on sleeping and eating, while at 3 months they are beginning to smile and show more social responsiveness. By 9 months, infants have usually already developed anger as well as other emotions.

Sam Has Recently Begun to Display the Emotion of Anger