Polydactyl, having extra fingers or toes, is an autosomal dominant disorder that occurs in cats as well as in humans. A cat breeder collects information about her cats and makes the pedigree below.

If the breeder wants to select a mother cat to produce a litter oof kittens without polydactyl which cat could she choose ?

A: cat 2 or 9
B: cat 3 or 6
C: cat 4 or 5
D: cat 6 or 8