The structure of the investigation report generally includes:

A. title, introduction, body and conclusion

B. Title, body and signature

C. beginning, introduction, theme and ending

D title, text and conclusion the investigation report is a written report written after a systematic and in-depth investigation of a certain situation, problem and experience according to a certain purpose. Its structure generally includes four parts: title, preface, subject and conclusion. So, the answer to this question is C.