An 89-year-old man has smoked two packs of cigarettes a day for more than 60 years and is in excellent health. a researcher does an in-depth study of this man in hopes of revealing universal principles related to the effects of smoking on health. however, the study may not provide useful results because the man is atypical. this illustrates a weakness of which method of descriptive research?

Case study                

Explanation:

A case study in psychology is defined as the use of a descriptive research approach to gain an in-depth investigation of a person or a group. There are various ways through which case studies can be conducted such as direct-observation, personal interviews, psychometric tests. Case studies are useful in getting detailed information about the person or a group. The chances of error are also high because the experimenter can provide biased information.

yes i would go with c

hope i

-lavira: )