A product line is a group of products that are closely related because they function in a similar manner, are sold to the same customer groups, are marketed through the same types of outlets, or fall within given price ranges.

A product line is a group of products that are closely related because they function in a similar manner, are sold to the same customer groups, are marketed through the same types of outlets, or fall within given price ranges.

A.产品线是一组密切相关的产品，因为它们的功能相似，销售给相同的客户群，通过相同类型的销售点销售，或在给定的价格范围内。

B.产品线是指密切相关的一组产品，因为它们以类似的方式发挥作用，售给同类顾客群，通过同一类型的渠道进行销售，或者售价在一定的幅度内变动。

C.产品线是指密切相关的一组产品，这些产品功能相近，出售给同一类顾客群体，通过同一类商行予以销售，价格均在限定范围内波动。

D.产品线是一组相关的产品，它们功能相似，销售给相同客户群，通过相同类型的销售点销售，在给定的价格范围内销售。

正确答案是C