Kirsten, a 4-Year-Old, Is Playing with Her Building Blocks

Multiple Choice

Kirsten, a 4-year-old, is playing with her building blocks. Her mother announces that they have to leave to pick up Kirsten's sister. Kirsten launches into a tantrum. What is the best explanation for Kirsten's reaction?

A) Kirsten is perseverating on the building blocks.
B) Kirsten is spoiled.
C) Kirsten's mother should have given a warning.
D) Four-year-olds throw many tantrums.