To find out how much faster Michael ran the race than Seth, we simply need to subtract the time it took each of them to complete the race.
Michael's time = 50.1 seconds
Seth's time = 58.5 seconds
Now, we calculate the difference:
58.5 seconds - 50.1 seconds = 8.4 seconds
Therefore, Michael ran the race 8.4 seconds faster than Seth.
The answer is C. 8.4 seconds.