When Buyers Hold Private Values, Which of the Following Conditions

Multiple Choice

When buyers hold private values, which of the following conditions leads to identical expected revenues under the English, sealed-bid, Dutch, and Vickrey auctions?

A) The true value of the good being auctioned is uncertain.
B) Some buyers adopt dominant strategies.
C) All risk-neutral buyers adopt equilibrium bidding strategies.
D) The probability that all competitors will choose the same bidding strategy is zero.
E) There are a large number of bidders with different reservation prices.