下列地基处理方法中，最常用最经济的深层地基处理方法是（）。

A.强夯地基法

B.夯实水泥土复合地基法

C.振冲地基法

D.水泥土搅拌桩地基法

Which of the following is least accurate regarding product development and marketing for firms under monopolistic competition（）

A. Firms that bring new and innovative products to the market face relatively more elastic demand curves than their competitors.

B. Relative to other types of competition, product innovation is critical to the pursuit of economic profits.

C. Advertising is necessary to communicate the uniqueness of the firm’s products relative to its competitors.