[FinA] Dаvis sits аcrоss the tаble frоm his client. He puts a puzzle оn the table and records whether his client grabs it to play with it. Next, Davis removes the puzzle and places a block of molding clay in front of the client and records whether his client grabs it. He continues to present a variety of different items and records whether or not his client approaches each item. What type of preference assessment method is Davis using?