Which Statement Best Describes a Cross-Sectional Study Spanning an Age

Which statement best describes a cross-sectional study spanning an age range of four years?

A) Individual differences are tracked over a four-year span.
B) Temporal descriptions of behaviour are obtained over a four-year span.
C) The data gathered from a single cohort are repeatedly assessed over a four-year span.
D) The data gathered across a four-year span are collected at the same time.