How Does a Comparative Descriptive Design Differ from a Typical

How does a comparative descriptive design differ from a typical descriptive design?

A) It compares statistics between the current time and an earlier time, whereas the typical descriptive design focuses on only one time period.
B) It compares a number of variables and examines the relationship between them, whereas a typical descriptive design never does this.
C) It differs in name only; both have the same design.
D) It describes data from two different groups, whereas a typical descriptive design focuses on a single group.