Tina Sommers Borrows $10,000 from Freddy Gomez and Gives Him

Tina Sommers borrows $10,000 from Freddy Gomez and gives him a chattel mortgage on her car and a chattel mortgage on her boat as security. Freddy registers the chattel mortgage on the car, but forgets to register the one on the boat. Tina sells the car and the boat to Betty Stover who knows nothing of either chattel mortgage. Which, if any, of the chattel mortgages is enforceable?

A) The one on the car
B) The one on the boat
C) Both A and B
D) Neither A nor B
E) Freddy will have to negotiate with Betty to determine if any of the chattel mortgages is valid