Match the followings:
| A. Survey | I. Directly questioning individuals to gather detailed responses |
| B. Experiment | II. Manipulating one variable to determine its effect on another variable |
| C. Observation | III. Systematic gathering of information through structured or unstructured interactions |
| D. Interview | IV. Collecting data by watching and recording behavior in a natural setting |
1
A-I, B-II, C-III, D-IV
2
A-I, B-III, C-IV, D-I
3
A-III, B-II, C-IV, D-I
4
A-IV, B-III, C-II, D-I