Answer:
D. Ethnography
Step-by-step explanation:
Ethnography study refers to the type of study that is conducted in order to observe how individuals interact with the environment around them.
From the excerpt above, we know that Dr. Greenhill want to find out the correlation between adolescent' outlooks/moral value and the daily lifestyle that those adolescents do in their day to day life. Since it require an observation to how the adolescents interact with their environment, ethnography study will Be the most suitable for Dr,. Greenhill.