What does it mean that insurance is divided into class A and class B?

At present, there are three kinds of auto insurance clauses in the market: A, B and C, and the clauses selected by various insurance companies will not change after being determined. The details are as follows: Plate A: Sunshine, PICC, China United, Dida, Tianan, Yongan, Anbang, Huatai, Volkswagen, China Life Insurance, Tokyo Maritime, etc. *** 1 1; Section B: Ping An, Hua 'an, Taiping, yongcheng, Sunshine Agriculture, Dubang, Bohai, Huanong, Min 'an, Ancheng, Allianz Guangzhou, Meiya Shanghai, Bao Li Huzhu Chongqing, etc. Section C: The terms of five companies, such as Pacific Insurance, Anhua Agriculture, Shanghai Anxin Sumitomo Mitsui Shanghai and Bank of China Insurance, are slightly different, but the premium difference is average. But the overall difference is not big, generally around 50 yuan.