If Firms in a Monopolistically Competitive Industry Are Operating with Economic

If firms in a monopolistically competitive industry are operating with economic losses, over time we would see

A) firms alter their advertising rates until they made at least normal profits.
B) some firms exiting the industry, causing the market supply curve to shift to the left, raising price.
C) some firms exiting the industry, causing the demand curves of the remaining firms to shift to the right.
D) the firms working together to increase price and everyone's profitability.