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?

A index
B preface
C bibliography
D acknowledgements

To cite works properly, you will have to follow the respective rules depending on the style which you are citing it in.if you are having trouble properly citing works, you can use websites such as the following to you: and

Jackson  said nullification 'means insurrection and war,' and called it a treasonous attack on america. the second aspect of the  force bill  was the passing in congress of a lower tariff in 1833. this was offered as a compromise to avoid conflict with south carolina, and to attempt to defuse the tense situation.source google

B. jumped to more than 50 percent in the past 20 years.