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Math·Algebra·Linear functions

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A bookstore is giving away free books every day. The equation $f(x)=162-9x$ gives the number of free books, $f(x)$, that remain to be given away after $x$ days. Which of the following is the best interpretation of $f(18)=0$ in this context?

A

The bookstore has 18 free books to give away.

B

The bookstore will give away 18 free books in 9 days.

C

It will take 18 days to give away all the free books.

D

It will take 162 days to give away 18 free books.