Which Statement Is a Research Purpose for a Correlational Study

Which statement is a research purpose for a correlational study?

A) "This study will compare the effects of an oral antidiabetic medication to effects of a placebo on glucose control in groups of randomly assigned subjects."
B) "This study will examine whether pre-appointment telephone reminders increase show rate among patients in an ambulatory well-patient clinic."
C) "This study will use direct observation to identify methods parents use to discipline children in public places."
D) "This study will use questionnaires and school transcripts to examine the relationship of dietary habits to grades among school-age children."

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