Jenny is dog sitting for 13 dogs. One runs away, and she is not sure which one. There were 3 Labradors (L), 2 Golden Retrievers (R), 3 Dalmatians (D), 4 terriers (T), and 1 bulldog (B) in the original group. What is the size of the population of dogs that could have run away from Jenny?
A:1
B:5
C:11
D:13