The formation of new words by joining two or more stems is calle

The formation of new words by joining two or more stems is called （ ）.
A、clipping
B、compounding
C、acronymy
D、back-formation
【正确答案】：B
【题目解析】：复合词，又称复合法，是指连接两个或多个词干的新词的形成。