—On the contrary, I think it is the mother, rather than her children, ___ to blame.

—I agree with you.

A. what is             B. that is               C. who are            D. which are

—On the contrary, I think it is the mother, rather than her children, _________to blame.

       —I agree with you.

       A. what is             B. that is               C. who are            D. that are

. —On the contrary, I think it is the mother, rather than her children, _________to blame.

       —I agree with you.

       A. what is             B. that is               C. who are            D. that are

—On the contrary, I think it is the mother, rather than her children, _________to blame.
—I agree with you.