Answer:
Cross-sectional study
Step-by-step explanation:
Dr. Bloom wanted to learn if ice cream preferences were different at different stages of development. For her study, she conducted a one-time assessment in which she asked a group of 5-year-olds, a group of 15-year-olds, and a group of 30-year-olds to identify their ice cream preferences. Dr. Bloom conducted a cross-sectional study. A cross-sectional study is used to compare different population groups at a single point in time, they are measures taken at one moment in time instead of over a period. Dr. Bloom studied ice cream preferences in a cross-section of individuals of different age.