The bitter cold the Midwest is experiencing is potentially life threatening ... ...

Determine whether or not there is an error in the underlined portion of the sentence above. If there is no error, select answer choice "A".
(A) stranded motorists unless well-insulated
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Press: Set C - Misplaced and Redundant Modifiers