The correct answer is: Option B. It creates a sinister tone that emphasizes the eeriness of the moon.
The adjectives silent, somber, and still are considered to be part of the device known as alliteration since they all start with the same letter.
If the first stanza of the poem is analyzed, the joyful and serene tone describing the landscape can be pointed out. This tone is contrasted once the reader focuses on the moon, which is described in an ominous matter, aiming to fill the reader with uneasiness when contemplating the differing elements in the story.