Each of the sentences provided may contain a grammar or usage error. Read each sentence and then identify its error, if there is one, by choosing the appropriate letter. If there is no error in the sentence, choose no error.

When you completed your homework so diligent, I knew that you had changed your attitude about accomplishing your academic goals.


A) When you


B) completed your homework


C) diligent, I knew


D)changed your attitude


E) no error