Grand theories of social sciences operate at a

The correct option is Higher level of abstraction.

Grand theories in the social sciences (such as structural functionalism, conflict theory, or symbolic interactionism) are designed to provide broad, overarching frameworks to explain large-scale social patterns, structures, and behaviors.
Because they seek to encompass a wide variety of social phenomena rather than explaining specific, localized events, they must operate at a higher level of abstraction.
This high level of abstraction allows the theories to remain generalizable across different cultures, societies, and historical epochs, rather than being tied down by the concrete details of a single, lower-level case study.