The kinked demand model is based on the assumption that each firm believes that A. there are strategic interdependencies in markets with high barriers to entry and a small number of firms in the market. Rivals will respond differently to increases and decreases in prices. O B. if it lowers its price, other firms will not lower their prices. O C. it is too costly to change prices. A slight change in the firm's variable costs will not affect prices. O D. the demand line facing the firms in an oligopoly market is kinked, causing a kink in the marginal revenue line, and there will be a vertical segment along the marginal revenue line where small changes in marginal costs will not affect prices and quantities