Aresearcher is interested in conducting a study to determine whether (and why) people who experienced a devastating event, such as a house fire where the family lost everything, suffer lasting effects (e. g., in relationships) over time. this researcher is interested in the development of the subject(s).

cognitive

Explanation:

According to my research on different types of research methods, I can say that based on the information provided within the question this researcher is interested in the cognitive development of the subjects. This type of development focuses mostly on how intelligence and behavior is affected by the different experiences that the individual has growing up.

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