Then the combination of these words to form permissible sentence

Then the combination of these words to form permissible sentences in languages is governed by rules. The study of these rules constitutes a major branch of linguistic studies, i. e., ______.
A、phonetics
B、phonology
C、morphology
D、syntax
【正确答案】：D
【题目解析】：Then the combination of these words to form permissible sentences in languages is governed by rules. The study of these rules constitutes a major branch of linguistic studies, i. e., syntax.