问题详情

Small businesses play a key role in the U. S. economy in the following aspects except ______ .
A．in distributing and retailing products of larger business to consumers
B．in innovation of new products such as pocket calculator, personal computer etc
C．in labor division and women"s liberation
D．in helping the big business by creating and delivering specialized products请帮忙给出正确答案和分析，谢谢！