The box plots compare the gross earnings, in millions of dollars, of movies during the months of June and July. Which statement correctly compares the two data sets?

a The difference in the medians is about a fourth of the range in June.
b The median in June is about half of the median in July.
c The difference in the medians is about twice the interquartile range in July.
d The median in June is about 1 million dollars less than the median in July.