Final answer:
Bret's briefcase left at the launderers is considered 'misplaced property' because it was unintentionally left due to negligence or forgetfulness.
Step-by-step explanation:
The briefcase that Bret left at Clean 'n Dry Launderers when picking up her clothes would be considered misplaced property.
Misplaced property refers to property that is unintentionally left somewhere due to negligence or forgetfulness. Since Bret left the briefcase inadvertently, it indicates that she did not intend to relinquish ownership, which would be the case with abandoned property.
Therefore, the correct option that defines Bret's briefcase in this scenario is misplaced property.