A Psychologist Asks a Group of 6-Year-Old Children to Describe

A psychologist asks a group of 6-year-old children to describe what they did last summer. Later that day the same psychologist asks 11-year-old children the same question. This is an example of a

A) longitudinal study of long-term memory.
B) cross-sectional study of long-term memory.
C) cross-sectional study of short-term memory.
D) longitudinal study of short-term memory.