c是啥东西

问题如下：

When assigning a company to an industry, which of the following is a limitation of using third-party industry classification schemes?

选项：

A.

Currency differences

B.

Single-product companies

C.

Strictly hierarchical taxonomies

解释：

C is correct. Commercial classification schemes such as GICS, IBC, and TRBC are examples of strictly hierarchical taxonomies that classify a company to a single group, regardless of whether the company sells multiple types of products or services.