Context: Doug is deciding whether to buy a copy of a book or borrow it from the library. He would like to be able to keep the book as long as he wants, but buying the book would cost money. He could borrow the book for free, but he would have to return it in a few weeks.
Suppose Doug decides to borrow the book from the library. Which result would be a cost?
A. Doug will save some money by not buying the book.
B. Doug will give up the chance to keep the book as long as he wants.
From the given choices, pick the correct answer and respond by indicating the letter of the correct option.

B