Chiko Has Possession of a Ring

Chiko has possession of a ring. He is entitled to keep it if

A) he found it on public property and the true owner cannot be located.
B) he stole it.
C) he found the ring while trespassing on private property.
D) he received it as a gift, but only if the person who gave it to him had previously acquired it by purchase.
E) he bought it from a thief in the honest belief that the thief was the true owner.