The sentence in question uses C. It is more clipped, so that it is read in bursts of words, which creates a rhythm for the rest of the story.
Step-by-step explanation:
The Chapman lighthouse, a three-legged thing erect on a mud-flat, shone strongly.
This is the sentence in question which stands out from the rest of the passage with its insistent use of the punctuation in it and The descriptive language that is paced into small parts.
All of this becomes essential to the story of Heart of Darkness which is masterfully fragmented and reveals layer by layer of the journey in this descriptive precision that is on display in one of its opening lines