Select the correct answer.

The Sniper
by Liam O'Flaherty

The long June twilight faded into night. Dublin lay enveloped in darkness but for the dim light of the moon that shone through fleecy clouds,
casting a pale light as of approaching dawn over the streets and the dark waters of the Liffey. Around the beleaguered Four Courts the heavy
guns roared. Here and there through the city, machine guns and rifles broke the silence of the night, spasmodically, like dogs barking on lone
farms.
Read the passage closely and answer the question below:
What is the backdrop of the passage?

A. The city was celebrating,

B. The city was asleep.

C. The city was at peace,

D. The city was undergoing a severe unrest.