Why do the Frank's and the Van Daan's have to go into hiding?

What is the best way to combine these sentences?

Which of the following best describes the proper use of a "works cited" page? (a)-a works cited page is not needed if you paraphrase your research. (b)-a works cited page is not needed if you use signal phrases. (c)-a works cited page is optional when writing a researched text. (d)-a works cited page is required when writing a researched text.

Romeo and juliet have fallen in love, even though their families despise one another. based on the excerpt, what are the two main purposes of this prologue?