How Is the Number of Pages in a Textbook Related

Multiple Choice

How is the number of pages in a textbook related to the price of the textbook? To find out, two Cal Poly freshmen (2006) randomly selected 30 textbooks at the campus bookstore and recorded the price ($) and number of pages for each book. Here's output from analyzing the data collected in the Corr/Regression applet. Assume, for now, that the normal approximation-based method is valid, and thus, the p-value from the Regression Table below is valid.
-What is the most appropriate null hypothesis for testing the regression slope using theory-based methods?

A) There is no association between number of pages in a textbook and price of the textbook.
B) There is an association between number of pages in a textbook and price of the textbook.
C) There is no linear association between number of pages in a textbook and price of the textbook.
D) There is a linear association between number of pages in a textbook and price of the textbook.