What does 'benched' mean?

[Yanty]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #28 "American Slang Words (2)", question 4

Jeff really wanted to play at the basketball game last night but his coach benched him for bad behavior this past week.

(a) forced him to clean the benches
(b) forced him to sit and watch the game
(c) forced him to be a cheerleader

English Idioms and Expressions, Advanced Level

ESL/EFL Test #28 "American Slang Words (2)", answer 4

Jeff really wanted to play at the basketball game last night but his coach forced him to sit and watch the game for bad behavior this past week.

Correct answer: (b) forced him to sit and watch the game
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What does 'benched' mean?

[Mister Micawber]

.
forced to sit and watch the game
.
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Native English teacher at Mister Micawber's