Which of the following best describes a cross-sectional data?

A. Staff numbers at a particular institution taken on a monthly basis in order to assess staff turnover rates.
B. The number of students registered for a particular course on a yearly basis.
C. An inventory of all ice creams in stock at a particular store.

Correct Answer: C

A and B are time-series data. They would be used to forecast likely data patterns in the future.