问题如下：
Which of the following companies have greatest potential to enhance its capacity?
选项：
A.restaurant
B.Refined petroleum produser.
C.Legal service provider.
解释：
C is correct.
Increase capacity of legal service is easier, because it does not involve substantial fixed capital investment or in case of a restaurant,outfiting rental or purchased space.
请问选这个选项的原因是什么，逻辑没懂。不选精炼油是因为产量变化小吗，不选餐厅是因为什么，选法律服务是因为法律人才有限，求一直大于供吗？
