Answer:
Foreword
Step-by-step explanation:
The preface is an introduction written by the author.
The foreword is a short piece that introduces the book and is written by someone other than the author.
The introduction is pretty much a summary of the main ideas of the book and it is written by the author.
The acknowledgements is written to express thanks to whoever helped the author write the book and it is written by the author.
Hope this helped! :)