Prices of PlayStation 4 Game Systems Are Similar at Almost

Prices of PlayStation 4 game systems are similar at almost every large retailer and little price competition occurs among these retailers.An explanation for this is

A) retailers are all price takers.
B) retailers have lobbied state governments to allow them to collude legally to set the prices of certain products.
C) pricing PlayStation 4 game systems is a repeated game. Over a long period of time, a cooperative equilibrium has been reached where retailers charge high prices for these systems.
D) retailers are in a prisoner's dilemma which causes them to all charge the same price for PlayStation 4 game systems.