Final answer:
Samantha exhibits the easy temperament style, which is characterized by positive emotions, adaptability to change, and self-regulation.
Step-by-step explanation:
Samantha, who is described as having a generally positive mood, regular rhythms, and an easy capacity to adapt to change, exhibits the easy temperament style. The seminal work of Thomas and Chess (1977) identified three specific temperaments—easy, difficult, and slow-to-warm-up—attributes that are discernible from early in life. Children with an easy temperament tend to show positive emotions, adapt quickly to change, and are able to self-regulate effectively. These characteristics align with Samantha's described behavior.