Final answer:
The two most essential elements of the sociological perspective are the relationship between individual behavior and culture, and the importance of historical context and social structure. 'Common sense' in sociology is subjective, as it varies across different cultures and individuals.
Step-by-step explanation:
The two most essential elements of the sociological perspective, as explained by C. Wright Mills in his concept of the sociological imagination, are the relationship between individual behavior and the wider culture, as well as the importance of historical context and social structure in shaping behavior and perceptions. The concept of 'common sense' in sociology is subjective because what may seem like common sense to one person or culture may not be viewed the same way by others. For example, in some cultures, it may be considered common sense for women to stay at home and take care of the household, while in other cultures, women are encouraged to pursue careers and have equal opportunities.