Answer:
A). The setting
Step-by-step explanation:
Setting is characterized as the description of the 'time, place, and circumstance in which the narrative is set in and the set of events take place.'
In the given excerpt, London develops the characters Kiche and the people through displaying their responses to 'the setting' and it is reflected through the descriptions like 'Fang's sudden paralysis for an moment and scrambling due to unknown, lurking in the midst of the sticks and moss', 'at the sound, Kiche leaped snarling...raged terribly', etc. which suggest that the their developments have been reflected through their cirucumstantial responses. Thus, option A is the correct answer.