Which sentence in this excerpt from Ambrose Bierce's "An Occurrence at Owl Creek Bridge" uses personification? Excepting the group of four at the center of the bridge, not a man moved. The company faced the bridge, staring stonily, motionless. The sentinels, facing the banks of the stream, might have been statues to adorn the bridge. The captain stood with folded arms, silent, observing the work of his subordinates, but making no sign. Death is a dignitary who when he comes announced is to be received with formal manifestations of respect, even by those most familiar with him. In the code of military etiquette silence and fixity are forms of deference.

The sentence in this excerpt from Ambrose Bierce's "An Occurrence at Owl Creek Bridge" that uses personification is:

Death is a dignitary who when he comes announced is to be received with formal manifestations of respect, even by those most familiar with him.

Explanation:

Here, Ambrose Bierce or the narrator addresses death as a person.  He makes death to become a dignitary, capable of visiting a person or community.  Grammatically, personification is a literary device or a figure of speech in which human attributes or characteristics are ascribed to non-human things or objects as if they were human.  It uses metaphor, another literary device, to achieve this attribution.