Wanda Is Conducting a Study of Social Behaviors Among Children

Multiple Choice

Wanda is conducting a study of social behaviors among children who are considered to be at high risk because one or both of their parents is in prison.Two observers rate the children's social skills,perform an intervention that consists of structured socialization opportunities,and then rate the children's social skills again.Unfortunately,neither of her original observers are available after the intervention,so she has to use two new observers.As a result,Wanda has a(n) ____ threat.

A) history
B) mortality
C) instrumentation
D) regression