As We Move Along a Production Possibilities Curve and Acquire

Multiple Choice

As we move along a production possibilities curve and acquire larger and larger amounts of one good (e.g. ,guns) ,the sacrifices of the alternative good (e.g. ,butter) become larger and larger.This is an illustration of

A) the law of demand.
B) the law of large numbers.
C) the law of supply.
D) decreasing opportunity costs.
E) increasing opportunity costs.