3. (　　)is the study of the characteristics of language varieties, the characteristics of their functions and the characteristics of their speakers as these three constantly interact and change within a speech community.-湖北继续教育网网校

[单选题]3. (　　)is the study of the characteristics of language varieties, the characteristics of their functions and the characteristics of their speakers as these three constantly interact and change within a speech community.

APsycholinguistics

BSociolinguistics