The correct answer is B. Syntax
Step-by-step explanation:
The word linguistics refer to the study of language and all the elements that are part of it such as grammar, sounds, meaning, among others. Because of this linguistic are divided into different branches or disciplines that focus on different elements of language. In the case of Syntax, this branch of linguistics mainly studies the principles and rules that are part of the structure of sentences or the way sentences are formed according to different elements and by following a strict word order. For example, according to syntax in the English language, most sentences follow the order of subject, verb, and object, but this varies according to the language. Therefore, it can be concluded it is syntax the branch of linguistics that studies word order.