The USDepartment of Justice Has Charged That Samsung,the World's Largest DRAM

The U.S.Department of Justice has charged that Samsung,the world's largest DRAM (dynamic RAM) maker,Hynix Semiconductor,Inc. ,Infineon Technologies AG,and Micron Technology,Inc.all conspired to set prices of computer memory between 1999 and 2002.This means the companies did which of the following?

A) tried to sell computer memory at below costs
B) charged customers different amounts for the same number of computer memory
C) colluded on the price they would charge customers for the computer memory
D) created an artificial demand for computer memory