The researcher employed a case study in order to investigate an individual showing a rare condition (Option A).
What is a case study research?
A case study research is a scientific investigation where empirical evidence is collected by only one sample, and whose results allow to understand the whole investigation.
This type of investigation (case study) allows to examine rare diseases/conditions including different types of genetic disorders, including, among others, beta thalassemia, adrenoleukodystrophy , mitochondrial diseases, Klinefelter Syndrome, etc.
In conclusion, in this case the researcher employed a case study in order to investigate an individual showing a rare condition (Option A).
Learn more about case studies here:
https://brainly.com/question/6434488
#SPJ1
