The answer would be synonym. A synonym is a word that means almost the same thing as another. When you pamper a pet you give them a lot of attention, or spoil them.
Answer:
B (the one you selected)
Explanation:
A is not right since many stories use more than one theme, especially in arcs.
C is not right since the subject is what the story is about, which can not line up with the theme.
D is not right because most real world examples do not do this.