Consider a Study on How Sibling Conflict Might Predict Poorer

Multiple Choice

Consider a study on how sibling conflict might predict poorer academic performance.If this study is trying to avoid the problem of unmeasured differences,a good strategy would be to

A) study the question using an experimental design.
B) select the sample at random to avoid selection bias.
C) get all of the information from the siblings' parents.
D) gather data on many dimensions of a large number of variables.