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 our diligent efforts, we couldn't hardly find (A) any tangible evidence whatsoever to (B) even remotely suggest that they weren't in any way involved (C) in the perplexing series of events that transpired. (D)