Read the sentence.

I wrote this book in order to help others solve a problem that I found challenging.

Which text feature would be most likely to include this sentence?

index
preface
bibliography
acknowledgements

acknowledgements

Explanation:

An acknowledgement is written by the author, usually at the beginning of their book which is sort of like an explanation.

A comma should follow a dependent clause when the dependent clause comes first in a sentence. A dependent clause is the clause which cannot stand alone in its meaning on the other hand independent clause refers to the phrase which can stand alone, though both have a subject and a verb

Explanation: