The answer to this question is the science of forensic study
It is greater that 3 due to the fact that the number 4 can go into number 8 two times and can't go into three and 2 can go into 8 4 times and can only go into 3 once
Answer: c) participant observation.
Explanation:
Participant observation is the qualitative research mechanism through which researchers get involved in the research activity along with the participants for studying and observing.It gives comprehensive understanding to researcher.It is usually carried out in field of sociology and anthropology.
According to the question,John is using participant observation as he is becoming a part of research along with homeless people to keenly observe the process and collect data on basis of that.
Other options are incorrect because secondary data analyzation, comparative research and qualitative technique are not used by investigator to become a part of research along with participants.Thus,the correct option is option(c).