Which of the Following Data Collection Methods or Tools Would

Which of the following data collection methods or tools would be used for qualitative data collection?

A) A telephone survey with questions that allowed respondents to answer on a scale of one to five.
B) An unstructured, in-depth interview conducted in a participant's home.
C) A form listing possible symptoms that clinical trial participants were told to complete after taking each dose of trial medication.
D) Vital statistics records used to classify women as having or not having adequate prenatal care.