To determine who played a big part in the rescue mission for Naomi's teddy bear, it would depend on the specific story or context you are referring to.
However, popular choices in stories and scenarios could include:
- A police officer (A)
- Naomi's teacher (B)
- A firefighter (C)
- A park ranger (D)
If you have additional context or details about the specific story involving Naomi and her teddy bear, I could provide a more accurate answer.