The function of （ ） is mainly to change the grammatical function

The function of （ ） is mainly to change the grammatical function of the stem rather than its meaning.
A、affixation
B、prefixation
C、suffixation
D、derivation
【正确答案】：C
【题目解析】：后缀通常改变单词的语法功能，而前缀通常改变词义。