The stem-and-leaf plot shows the number of words in the classified ads in a newspaper one day.



How many ads had at least 20, but fewer than 45, words?



1 0 3 3 5 7 9

2 0 0 1 4 5

3 3 8 8

4 7

5 2



key:1|0 = 10



A. 6

B. 3

C. 10

D. 8