Select the most appropriate meaning of the underlined idiom in the given sentence.

He knows the ins and outs of the case and has been chosen to defend the accused.

complete details

The answer is complete details.

The idiom "ins and outs" means the complete details or inner workings of something. In the sentence, "He knows the ins and outs of the case and has been chosen to defend the accused," it means that the lawyer knows all the details of the case, including the evidence, the witnesses, and the law. This is important because it allows the lawyer to develop the best possible defense for the accused.

The other options are not correct.

• "Expense involved" refers to the cost of something. This is not the meaning of the idiom in the sentence.
• "Time needed to complete" refers to the amount of time it takes to do something. This is not the meaning of the idiom in the sentence.
• "High stakes" refers to the importance or significance of something. This is not the meaning of the idiom in the sentence.