Price Discrimination Is Legal Under Which of the Following Conditions

Multiple Choice

Price discrimination is legal under which of the following conditions?

A) when a manufacturer sells to retailers in different markets
B) when a seller advertises prices that are not actually available to consumers
C) when a seller has not communicated with competitors before announcing prices
D) when a manufacturer and reseller have agreed upon a specified retail price for a product
E) when a seller can prove its costs are different when selling to different retailers