Woodburns S. O. S. charity collected shoes by the following ways EXCEPT______.A．gathering

Woodburns S. O. S. charity collected shoes by the following ways EXCEPT______.

A．gathering up his friends" stash of slightly worn sneakers

B．recycling shoes with little fault from the sporting goods store

C．collecting from the students of two high schools and the USC

D．picking up worn shoes from door to door in the town

请帮忙给出正确答案和分析，谢谢！