Answer:
d) experimental research.
Step-by-step explanation:
Experimental research is one where a product is relentlessly tested for all the information about its results. In general the environment is artificial and shows its development even before it is launched. This would be the most appropriate type of research for a clinician who is interested in determining whether a new therapeutic method is effective in treating depression.
Considered the best methodology to be used in the scientific sector, experimental research is capable of isolating the structures from the outside environment so that there is no interference of any kind. This way, your results are much more reliable.