Which of the following statement is NOT true?（ ）

Which of the following statement is NOT true?（ ）
A、Prefixation is the formation of new words by adding suffixes to stems.
B、Prefixes do not generally change the word-class of the stem.
C、Prefixes only modify the meaning of the stem.
D、Present-day English finds an increasing number of class-changing prefixes.
【正确答案】：A
【题目解析】：A选项错误。正确的表述为"Prefixation is the formation of new words by adding prefixes to stems. "前缀法是通过在词干上添加前缀来形成新词。