Which of the Following Is One Reason Why Trade Makes

Which of the following is one reason why trade makes all parties better off?

A) ​Because it always expands the amount of domestic production of each good and service, and more is preferred to less.
B) ​Because it permits all parties to acquire some items better suited to their tastes.
C) ​Because it makes people appreciate what they have, and they are happier.
D) ​Because it encourages consumption rather than saving.