Which Factor or Situation in a Report of a Study

Which factor or situation in a report of a study using a correlational design would cause a nurse researcher to question the validity of the study?

A) The study does not have a nontreatment control group.
B) The researchers conclude that a causal relationship exists between the variables.
C) The researchers suggest the findings have a practical application in a clinical setting.
D) The researchers used existing instruments to measure the variables instead of developing specific instruments for the study.

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