A Study Found Higher Rates of Crime in Cities with an International

Multiple Choice

A study found higher rates of crime in cities with an international airport, compared to cities without an international airport .But the study failed to take account of the size of the city (population) , and bigger cities tend both to have more crime and to have international airports .The findings of this study suffer from

A) Measurement bias
B) Omitted variable bias
C) Sample selection bias
D) All of the above