Which argument is an example of overgeneralization?

a. my german shepherd bit several family members before i got him a new collar, but has not since then. the new collar must have stopped him from biting.

b. i want to get a german shepherd as a pet, but my friends say that it is likely to bite me and won't be a good pet. i agree with them.

c. i was bitten by a german shepherd as a child, so i do not want to get a dog as a pet because it will bite me.

d. my german shepherd has bitten two people, so i have to send him to the pound or muzzle him.
anybody? ?