You Have Come Across a Dog (Named Cindy)that Does Not

You have come across a dog (named Cindy) that does not have a tail.Interestingly,all the puppies produced by this dog don't have a tail.If the lack of tail is caused by a genetic mutation,where has this mutation most likely taken place?

A) in Cindy's gametes
B) in the cells that should normally have given rise to Cindy's tail
C) in the cells that should normally have given rise to Cindy's and her puppies' tails
D) in all of Cindy's cells (including her gametes)
E) in a gamete of one of Cindy's parents