政大研究所的阅读测验，有字义问题求解
文章：
(前段略，大意在讲美国人口密集度较其他国家低)
Contrary to widespread beliefs, high population density is a value
not a disvalue. High population density intensifies the division of labor,
which makes possible a wider variety of jobs and specialized consumer products.
For instance, in Manhattan, there is a "doll hospital" a store specializing in
the repair of children's dolls. Such a specialized, niche business requires
a high population density in order to have a market. Try finding a doll hospital in Poughkeepsie. In Manhattan, one can find a
job as a Pilates Method teacher or as a "Secret Shopper" (two jobs actually
listed on Craig's List). Not in Paducah.
People want to live near other people, in cities. One seventh of England's
population lives in London. If population density is a bad thing,
why are Manhattan real-estate prices so high?
问题
What does "niche" probably mean in the context?
(A)of a religious denomination (B)of a special kind
(C)of a small size (D)of some significance
我的选择是(C)，朋友的选择是(B)
因为niche本义是指小神龛，在本文中，niche前面以经出现过specialized
查了剑桥字典也是偏向指小规模的意思
但是查了牛津字典，又有表示专门的意思
所以想请版友协助。应该要选择B或是C呢?