There are two approaches to the study of polysemy. They are（ ）

There are two approaches to the study of polysemy. They are（ ）
A、primary and secondary
B、central and peripheral
C、diachronic and synchronic
D、​formal and functional
【正确答案】：C
【题目解析】：多义关系的两个研究方法分别是历时方法 (Diachronic approach)和共时方法 (Synchronic approach)。