An Efficient Distribution of a Certain Quantity of Goods Between

An efficient distribution of a certain quantity of goods between two parties is one in which:

A) neither party can be made better off by changing the allocation of the goods.
B) one party can be made better off at the expense of the other by changing the allocation of the goods.
C) both parties evenly divide the total quantities of the goods.
D) neither party can be made worse off if the allocation of the goods is altered.