In Chinese there are two sets of names zumu/nainai, waizumu/waipo for the English word "grandmother". This reflects that ________.
选项：

A:these so-called equivalents are only partly equivalent
B:Chinese emphasize more on kinships and have tight interpersonal relationships.
C:terms in one language find no counterparts in the other language.
D:we have to find appropriate words to express ourselves in a foreign language