Question

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Which sentence below shows correct use of em dashes?

In a-thousand-years, most of our greatest monuments such as they are will have crumbled to nothing.

In a thousand years, most of our greatest monuments – such as they are – will have crumbled to nothing.

In a thousand years, most of our greatest – monuments such as – they are will have crumbled to nothing.

In a thousand years, most of our greatest monuments such as they are will have crumbled-to-nothing.