Answer: option C: Problem of self-selection into groups
Step-by-step explanation:
Correlational research method is normally used to know whether two variables that is been understudy are related and then predictions are usually made on the basis or result of this relationship. correlational research predictive capabilities is its powers.
A correlational study usually and only used to depite or describe or predict behavior but usually not to explain it.
correlation is restricted due to the fat that in establishing the existence of a relationship, it reveals minute or small details about cause and effect.
Correlational studies are prone usually to bad or faulty interpretation due to the groups it is being compared through self-selection is formed.selection bias is another name for it. When studing cause cause they are unable to alter, they do use correlational designs that see or process the relationships between variables.