(lc)which sentence below shows correct use of em dashes?

a) in a-thousand-years, most of our greatest monuments such as they are will have crumbled to nothing.
b) in a thousand years, most of our greatest monuments – such as they are – will have crumbled to nothing.
c) in a thousand years, most of our greatest – monuments such as – they are will have crumbled to nothing.
d) in a thousand years, most of our greatest monuments such as they are will have crumbled-to-nothing.

Juanito. hey, don't leave yet. what type of work? and where? who do i see? hey, don't leave yet! the duende. (the duende stops and turns). be careful. danger. danger. (he exits.) —blanca flor, angel vigl read these lines from the play again, then rewrite them as they might appear in a novel. the answer is 'hey, don't leave yet," cried juanito. "what type of work? and where? who do i see? hey, don't leave yet! " the duende stopped and turned back to juanito. "be careful. danger," he warned. as he turned to leave, he repeated: "danger."