Final answer:
The histograms display the annual number of traffic fatalities over time, option a.
Step-by-step explanation:
The correct statement that accurately describes the representation of the two histograms depicting annual traffic fatalities in passenger cars is a) The histograms display the annual number of traffic fatalities over time.
A histogram is a graphical representation of a frequency distribution, where the horizontal scale represents classes of quantitative data values and the vertical scale represents frequencies. In this case, the x-axis of the histograms would represent different years, and the y-axis would represent the number of traffic fatalities. The heights of the bars in the histograms would correspond to the frequency of traffic fatalities in each year, providing a visual representation of the annual number of traffic fatalities over time.