Looking back on the bargains Brother Miller had with them, the three young men knew very well that he changed his mind about marbles all the time so that （ ）.

Looking back on the bargains Brother Miller had with them, the three young men knew very well that he changed his mind about marbles all the time so that （ ）.

A.

they could learn how to be successful in business

B.

they could keep on with their hobby of collection

C.

he could offer them something free without hurting their self-esteem

D.

he could keep the boys coming to visit his stand and to buy something

正确答案是C