What is one characteristic of a strong theme?

A. It's a detail from the story

B. It's a character in the story

C. It's an obscure concept

D. It's a complete statement

The answer questions to your is d.

The strong themes or major themes are the more important and enduring arguments of the story, are part of the entire story and are significant for its develop, can be easily identify because are notorious, follow and sustains the plot or ideas, one characteristic of a strong theme is It's a complete statement, the answer is D.