Attrition Can Be a Problem in Longitudinal Studies

Multiple Choice

Attrition can be a problem in longitudinal studies. This means:

A) Participants enjoy it more the longer they are involved in the research
B) Participants drop out over time
C) The experimenters develop new research ideas
D) The materials and equipment get lost over the time of the research
E) Participants start to realise what the study is about and change their behaviour