The stem-and-leaf plot shows the number of e-mails a business woman received each day during her vacation.
Which conjecture is supported by the data?
A On a typical day, she received about 8 e-mails.
B She was on vacation for 30 days.
C She never received more than 30 e-mails in one day.
D She never received fewer than 9 e-mails in one day.