On the contrary,I think it is Tom,you,to blame
A.more than; areB.less than; who areC.rather than; that isD.rather than;is在线课程C
解析：
rather than“而不是”连接并列主语时谓语动词单复式与前者保持一致，本题与Tom保持一致所以谓语用单数形式；
此题又用到了强调句型所以答案应为C。