Final answer:
The data set that represents the dot plot showing the pulse rates of marathon runners is most likely Option C, which includes repeated values and pulse rates typical of athletes, falling within a common range for marathon runners.
Step-by-step explanation:
The question appears to involve analyzing a dot plot and matching it with one of the given data sets. Dot plots are a form of data representation where each data value is represented by a dot above a number line. The correct data set to match the given dot plot would be the one where multiple dots can be seen at the same point if a value occurs more than once.
Based on the fact that we're discussing pulse rates of marathon runners, which typically range from 140 to 180 beats per minute for athletes in such condition, and also because pulse rates are often in whole numbers, Option C with repeated values such as 140, 165, 170, and 180 is the most likely to represent a dot plot of pulse rates.