Dale Is a Guitar Teacher and Terrence Is a Tile

Multiple Choice

Dale is a guitar teacher and Terrence is a tile layer. If Dale teaches Terrence's daughter to play the guitar in exchange for Terrence tiling Dale's kitchen floor,

A) only Dale is made better off by trade.
B) only Terrence is made better off by trade.
C) both Dale and Terrence are made better off by trade.
D) neither Dale nor Terrence are made better off by trade.