One disadvantage of longitudinal designs is that

A) the groups selected for comparison may differ in more regards than just age.
B) the results cannot be analyzed statistically.
C) it is hard to separate differences due to age from differences due to changes in society.
D) the results must be inferred from memories reported long after the events actually occurred.

Longitudinal Designs

Research methods that involve repeated observations of the same variables (e.g., subjects) over short or long periods of time.

Society Changes

The transformations or alterations that occur within societies over time, encompassing shifts in norms, values, and cultural practices.

Age

is a measure of the amount of time an individual or object has existed, often counted from the date of birth or creation.