The oldest trick in the book?

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #543 [color=blue]“English Slang Idioms (144)”, question 4

He knew there was a chance of losing by attempting a Fool’s Mate on his opponent in chess. He decided to try it. It was the oldest trick in the but it had still worked on many past opponents.

(a) trade
(b) basket
© book
(d) set

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #543 [color=blue]“English Slang Idioms (144)”, answer 4

He knew there was a chance of losing by attempting a Fool’s Mate on his opponent in chess. He decided to try it. It was the oldest trick in the book but it had still worked on many past opponents.

Correct answer: © book
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The answer is logic of course" a trick in the book" but as it is an idiom I thought of the basket. I’ve mistaken.

The idiom is ‘the oldest trick in the book’. Something that has been done successfully in that situation many times before.