Answer:
Option D, laboratory experiments.
Step-by-step explanation:
Whenever a researcher is posed to study about any artificial situation, it becomes easy for them to study it through experimentation. For artificial situations, researcher get the freedom to make changes in the variables. Also, they can introduce control variables. While on the other hand studying a real scenario would require designing of an objective based questionnaire and then conduction a survey to get real inputs.
Hence, option D is correct