Abby Bakes Brownies and Liam Grows Flowers

Multiple Choice

Abby bakes brownies and Liam grows flowers.In which of the following cases is it impossible for both Abby and Liam to benefit from trade?

A) Abby does not like flowers and Liam does not like brownies.
B) Abby is better than Liam at baking brownies and Liam is better than Abby at growing flowers.
C) Liam is better than Abby at baking brownies and at growing flowers.
D) Both Abby and Liam can benefit from trade in all of the above cases.