Kerri Wanted to Study the Effects of Having the Oldest

Kerri wanted to study the effects of having the oldest child in a family go off to college.She decided to use her own family after her brother went off to a college in France.She took notes each day on her parents' behavior and kept a diary of her own reactions.Kerri was using the technique called ____________________.

A) participant observation
B) family survey
C) observer bias
D) attribution effect