It has been reported that people who trust other people are generally happier than people who do not trust others. This conclusion is probably based on the results of a

A) double-blind experiment.
B) case history.
C) correlational study.
D) single-blind experiment.

Correlational Study

A research method used to examine the relationship between two or more variables without manipulating them, identifying patterns or associations.

Double-Blind Experiment

An experimental setup where both the subjects of the experiment and the persons administering the experiment are unaware of the specifics of the test scenario to prevent bias.