The correct answer is D. collision diagram.
A collision diagram is a type of diagram that shows the approximate path of vehicles and pedestrians involved in accidents. It is used to help investigators understand how the accident happened and to identify potential causes.
Spot maps are maps that show the location of accidents. They are often used to identify areas where accidents are more likely to occur.
Pie charts are circular charts that show the relative proportions of different parts of a whole. They are often used to show the distribution of injuries or fatalities in accidents.
Condition diagrams are diagrams that show the condition of vehicles and pedestrians involved in accidents. They are often used to identify potential causes of accidents.