Answer:
The theme of this book is about the revenge.
Answer: clause
Explanation: there is no subject in the sentence
A story's deeper meaning is called its its theme.
I think???
The correct answer for the question that is being presented above is this one: "<span>Jameson's "Story of the Rear Column of the Emin Pasha Relief Expedition" was published in an atmosphere of heated debate concerning the dubious success of the expedition and the rumors of atrocities connected with it, confirmed by two details of the book which are echoed in Heart of Darkness. </span>