Final answer:
Kirsten's tantrum can be explained by her stage of cognitive and psychosocial development as a 4-year-old. At this age, children are beginning to establish independence and assert their preferences.
Step-by-step explanation:
Kirsten's reaction can be explained by her stage of cognitive and psychosocial development as a 4-year-old. At this age, children are beginning to establish independence and assert their preferences. Kirsten's tantrum can be seen as a way for her to express her strong emotions and test boundaries. It is important to note that frequent tantrums are common for children her age as they navigate their emotions and learn how to communicate effectively.