The correct answer is: C. to compete successful with the rival firms
A firm under monopolistic competition advertises to create a brand identity and differentiate itself from its rivals. This can help the firm to attract more customers and charge a higher price.
Option A is incorrect because advertising does not usually lower the cost of production. In fact, advertising can be quite expensive.
Option B is incorrect because advertising does not always lead to increased sales and profits. In some cases, advertising
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