Which statement is always true?
A. Observational studies are governed by regulations involving human subjects.
B. Observational studies cannot determine the likelihood of relationships between two variables since they cannot manipulate conditions.
C. Data collection is difficult because of the time and effort required to observe a large number of subjects.
D. The accuracy of observational studies depends on the truth of the person collecting data, the measurement tool, and the accuracy of any subject being asked a question.
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