A development team is refining an AI assistant designed to help users brainstorm creative story ideas. Their refinement process involves giving the AI a single starting instruction, generating several different story concepts based on it, and then having human writers rank these concepts from best to worst. The team's primary goal is to teach the AI how to generate more imaginative and diverse narratives.

The team is considering two potential starting instructions:

1. "Write a story about a detective who solves a crime."
2. "What is the definition of the 'hero's journey' story structure?"

Analyze both options and determine which one is more suitable for the team's refinement process. Explain your reasoning, focusing on why your chosen option is better aligned with the goal of teaching the AI to be more imaginative and diverse.