23. Which of the following statements is true? Hint: think carefully about how the ability to set price may or may not give a rm with market power an advantage over a perfectly competitive rm in response to a reduction in marginal costs. a) A reduction in marginal costs can reduce producer surplus in both a perfectly competitive market and a market where a rm has market power. b) A reduction in marginal costs will not reduce producer surplus in either a perfectly competitive market or a market where a rm has market power. c) A reduction in marginal costs can reduce producer surplus in a perfectly competitive market, but will not reduce producer surplus in a market where a rm has market power. d) A reduction in marginal costs can reduce producer surplus in a market where a rm has market power, but will not reduce producer surplus in a perfectly competitive market