Words produced through ( ) account for the largest part of the

Words produced through ( ) account for the largest part of the total number of new words through word-formation.
A、conversion
B、compounding
C、shortening
D、affixation
【正确答案】：D
【题目解析】：Words produced through affixation constitute 30%-40% of the total number of new words. 通过词缀法产生的新词占到了30%-40%，是最多的比例了。