When Firms in a Price-Taker Market Are Temporarily Able to Charge

When firms in a price-taker market are temporarily able to charge prices that exceed their production costs,

A) the firms will earn long-run economic profit.
B) additional firms will be attracted into the market until price falls to the level of per-unit production cost.
C) the firms will earn short-run economic profits that will be offset by long-run economic losses.
D) the existing firms must be colluding or rigging the market, otherwise, they would be unable to charge such high prices.