Directions: The given sentence is divided into four parts A, B, C, and D. Choose the part that contains an error as your answer. If the sentence is error-free, mark 'No error' as your answer.

Despite her diligent efforts, the scientist couldn't (A) tease off the complex interactions between the variables, (B) leaving the hypothesis hanging on tenterhooks (C) and the research project in disarray. (D)