Choice "C" is correct. The security agreement must be signed or authenticated by the debtor.
Choice "b" is incorrect. The Secured Transaction Article permits a creditor to assign all or part of his rights under a security agreement. A statement of assignment must be signed by the creditor, not the debtor.
Choice "d" is incorrect. The Secured Transaction Article permits a creditor to release all or part of his rights to collateral described in a security agreement. A release of collateral must be signed by the creditor, not the debtor.
Choice "a" is incorrect. A termination statement terminates a security interest in collateral. The termination statement must be signed by the creditor, not the debtor.