While the employees expected the new manager to bring innovative changes, his policies turned out to be nothing more than old wine in a new bottle, disappointing everyone who had hoped for progress.What does the underlined idiom mean?

Explanation

The idiom 'old wine in a new bottle' means that something has been presented in a new way but remains fundamentally unchanged. In this context, it reflects the employees' disappointment that the new manager did not bring innovative ideas, but rather repackaged old policies. Options A, C, and D misinterpret the idiom by suggesting it refers to completely new concepts, risky endeavors, or useless inventions, respectively, which do not capture the essence of superficial change.