Words of the basic word stock can each be used alone, and at the same time can form new words with other roots and affixes, e.g. foot is the father of football, footage and footprint. This demonstrates that one of the characteristics of the words of

Words of the basic word stock can each be used alone, and at the same time can form new words with other roots and affixes, e.g. foot is the father of football, footage and footprint. This demonstrates that one of the characteristics of the words of the basic stock is ______ .

A.productivity

B.polysemy

C.stability

D.collocability

正确答案是A