Context: Scarlett is deciding whether to buy a copy of a book or borrow it from the library. She would like to be able to keep the book as long as she wants, but buying the book would cost money. She could borrow the book for free, but she would have to return it in a few weeks.
Suppose Scarlett decides to borrow the book from the library. Which result would be a cost?
A. Scarlett will give up the chance to keep the book as long as she wants.
B. Scarlett will save some money by not buying the book.
Answer with the option's letter from the given choices directly.

A