In a sale on approval (or sale or return), the goods are sent to the buyer on approval. The property only passes when the buyer signifies acceptance or adoption of the goods, or does any other act adopting the transaction. The key is the buyer's positive indication of acceptance, not merely failure to return within a reasonable time. The option C is incorrect because failure to return goods alone is not sufficient - there must be clear adoption of the transaction. The correct answer B precisely captures this legal principle.