没懂

问题如下：

Richardson starts his analysis by evaluating the characteristics of the men’s retail clothing industry. He finds few barriers to new retail entrants, high intra-industry rivalry among retailers, low product substitution costs for customers and a large number of wholesale clothing suppliers.

Based on Richardson’s industry analysis, which of the following characteristics of men’s retail clothing retailing would positively affect its profitability? That industry’s:

选项：

A.entry costs. B.substitution costs. C.number of suppliers.

解释：

The men’s retail clothing industry is characterized by a large number of wholesale clothing suppliers. When many suppliers of the products needed by industry participants exist, competition among suppliers should limit their ability to raise input prices. Thus the large number of suppliers is a factor that should positively affect industry profitability.