Final answer:
The histogram of the finishing times of all participants in the race represents the population distribution.
Step-by-step explanation:
The best description for the histogram of the finishing times of all the participants in a recent large race would be b) Population distribution.
A population distribution represents the distribution of a characteristic across an entire population, in this case, the finishing times of all the participants in the race. The histogram would show the frequency or count of participants in each time interval.
For example, the histogram might show that there were many participants who finished between 40-45 minutes and fewer participants who finished under 30 minutes or over 60 minutes.