Mary Received a Non-Solicited Selection of Compact Discs in the Mail,with

Mary received a non-solicited selection of compact discs in the mail,with a letter informing her that she was now a member of the CD of the Month Club.It also said that if she didn't want these CDs,she could simply send them back; otherwise,she would be billed $10 for each CD at the end of the month.She put the CDs away,and did not respond.The club continued to send her CDs each month until she had received 100 of them over a period of 10 months.The club then sent her a letter demanding payment; otherwise,it would take legal action.Explain Mary's legal obligation in these circumstances.