Subject: mathqa
Question: a certain experimental mathematics program was tried out in 2 classes in each of 26 elementary schools and involved 32 teachers . each of the classes had 1 teacher and each of the teachers taught at least 1 , but not more than 3 , of the classes . if the number of teachers who taught 3 classes is n , then the least and greatest possible values of n , respectively , are
Option: 
A: 0 and 13
B: 1 and 9
C: 0 and 14
D: 1 and 10
Answer: D