Final answer:
The scenario described is an example of a prevention cost. The florist noticed the mistake with the arrangement just prior to loading it into the delivery van and was able to prevent an external failure cost by removing the unwanted lilacs.
Step-by-step explanation:
The scenario described is an example of D. a prevention cost. In this case, the florist noticed the mistake with the arrangement just prior to loading it into the delivery van. By catching the mistake, the florist was able to prevent an external failure cost, which would occur if the arrangement had been delivered with the unwanted lilacs. By removing the lilacs and making the order right, the florist prevented a potential customer complaint or dissatisfaction, saving the business from potential costs and damage to their reputation.