Which of the Following Research Situations Best Represent an Example

Multiple Choice

Which of the following research situations best represent an example of correlational research?

A) A psychologist administers to his participants a mood questionnaire and collects their demographics data and then looks at the relationship between the variables he considered.
B) A psychologist administers to her participants either 3 mg of sugar or 8 mg of sugar and then asks them to complete a mood questionnaire. She will subsequently examine if sugar had an effect on participant's mood.
C) All of the choices are correct.
D) None of the choices are correct.