菱形的两条对角线长分别是6cm和8cm，则它的面积是[ ]

A.6cm²

B.12cm²

C.24cm²

D.48cm²

Which of the following is least likely a condition that characterizes competitive price-searcher markets (monopolistic competition)（）

A. Low barriers to entry.

B. Large number of independent sellers.

C. Producers face horizontal demand curves.