NO.PZ2023010401000037
问题如下：
In an industry comprised of three companies, which are small-scale manufacturers of an easily replicable product unprotected by brand recognition or patents, the most representative model of company behavior is:
选项：
A.oligopoly.
B.perfect competition.
C.monopolistic competition.
解释：
The credible threat of entry holds down prices and multiple incumbents are offering undifferentiated products.
中文解析：
进入威胁压低了价格，多家老牌企业都在提供没有区别的产品。
A选项的特征是啥？老是记不住怎么办
