Professor Nagini Developed a Measure to Rate Children's Fears

Professor Nagini developed a measure to rate children's fears. To test inter-rater reliability, he

A) compared the level of agreement between two different observers who used his measure simultaneously.
B) used people who were part of children's natural environment to do the rating.
C) compared the degree to which children from different cohorts scored similarly.
D) compared the extent to which his measure correlated with neurobiological measures of distress.