To evaluate a merger between Zillow and Trulia, federal regulators would A. interview all the parties, calculate the Herfindahl-Hirschman Index, and apply the merger standards. B. define the market, calculate the price elasticity of demand, and apply the merger standards. C. interview all the parties, calculate the price elasticity of demand, and apply the merger standards. D. define the market, calculate the Herfindahl-Hirschman Index, and apply the merger standards