The data distributions below show the running times of a group of runners before and after training for a marathon. Which statement CORRECTLY explains the summary statistics that should be used to compare the running times?
A
The distributions are normal, so the mean and standard deviation should be used to compare the running times.

B
The distributions are skewed, so the mean and standard deviation should be used to compare the running times.

C
The distributions are normal, so the median and interquartile range should be used to compare the running times.

D
The distributions are skewed, so the median and interquartile range should be used to compare the running times.