问题如下：
The characteristic to produce high returns on capital for an industry is least likely having:
选项：
A. High industry concentration.
B. High barriers to entry.
C. Short lead times to build new plants.
解释：
C is correct.
High barriers to entry and high industry concentration will produce higher returns on capital for an industry. Industry capacity can be rapidly increased to satisfy demand with short lead times, however, it may also lead to overcapacity and lower profits.
c不太明白？神马意思