Editorial: The measures taken by our government to force Corollia to prevent Corollian criminal rings from illegally copying computer software developed in this country have failed. If they had succeeded, there would not have been a steep drop over the past year in the prices that our nation's computer companies can command in Corollia for legally imported copies of their software.
The argument above depends on which of the following assumptions?

(A) Over the past year, computer companies in the editorial writer's country shipped considerably fewer copies of software to Corollia than they had shipped in recent years.
(B) The price of computer software legally produced in Corollia did not experience a drop over the past year.
(C) The sales of computer software legally produced in Corollia rose over the past year.
(D) A decline in demand for computer software throughout Corollia during the previous year was not the only reason for the decline in the prices of computer software in that country.
(E) There is no market for the computer software illegally copied by Corollian criminal rings outside Corollia itself.

The argument given in the comprehension depends on the assumption that "A decrease in quantity demand for software throughout the country during the previous year is not the only reason for the decrease in prices of software in this country."

Assuming that there is a decrease in the quantity demand is the only cause of the drop in prices, then we can't claim that failure is in the methods implemented by the government.