Answer:
I believe the best answer to be A. dull as well.
Step-by-step explanation:
We may define mood as the atmosphere created by an author with the purpose of involving readers. Word choice, description of the setting, imagery, they all help create a certain mood and, consequently, make readers present an emotional response to the atmosphere - happiness, tranquility, fear etc.
The excerpt we are studying here was taken from William Faulkner's "The Sound and the Fury". Word choice and imagery play a big role in creating this excerpt's mood, which is dull. The author employs words such as "dingy", "ghostly", "faded", "died away". They help evoke a sense of dullness, of boredom and sameness, as if nothing ever happens and, when something does happen, it quickly disappears.