[求助]一道阅读题，

我想去美国

2001-05阅读02

blacksmiths,silversimiths,and candle makers are mentioned in line 5-6 as examples of artisans who____

A mantained their businesses at home

D would employ only family member

答案是A，可我选了D。麻烦各位，我怎么就想不通？