What is universal theme?
Universal theme is a motif that can apply to anyone and everyone regardless of ethnicity, nationality, age, and status.
Knowing this, we can easily conclude that universal theme is: a theme that speaks broadly to human experiences. Now some might debate that choice C is correct, however please note that choice C explicitly states that a theme can only be applied to members of a "certain culture." That is a fallacy. Universal theme applies to all humans and human experiences, not just for a select group.