Jon Steals an Old,battered Bicycle That Is Parked,unlocked,in Front of a Convenience

Jon steals an old,battered bicycle that is parked,unlocked,in front of a convenience store.He repairs,paints,and replaces parts on the bike until it is like new.The original owner,Kim,claims the bike.The bike belongs to 

A)  ​Jon and Kim as tenants in common. 
B)  ​Jon because he made substantial improvements to it. 
C)  ​Jon because Kim claimed it only after John improved it. 
D)  ​Kim because Jon stole it.