Experiment that take place in the natural setting of the real world rather than in a laboratory A. Field experiments
B. Closed/open questions
C. Qualitative data
D. Laboratory experiments
Which one is the right answer?

a is correct answer

Explanation:

Field Experiment. Field experiments are done in the everyday (i.e. real life) environment of the participants. ... Strength: behavior in a field experiment is more likely to reflect real life because of its natural setting, i.e. higher ecological validity than a lab experiment.

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answer; i believe the correct answer is (4) flip a coin as each participant arrives,heads indicates assignment to the first group: tails indicates assignment to the second group;