Concept:The physical environment is made up of natural things (land, water, air, plants, food and the human body's natural needs). The social environment is made up of people and their relationships, such as the family.
Solution:A mother breastfeeding her baby joins both: the mother-child relationship is part of the social environment (the family), while breast milk is a natural, physical resource the baby needs to live and grow. So this activity shows interaction between the physical and social environments.
A father advising his child is only a social relationship. A man listening to music is a social or cultural activity. Elephants drinking water from a river involves only animals and water, that is, the physical environment alone, with no human society.
Answer:Option B (A mother breastfeeding the baby)