The correct response is "guilt and gloominess."
In the context of the story, the interactions between Cora's responsibilities and emotional burdens (which can be associated with guilt) along with the gloomy atmosphere created by their circumstances as orphans contribute to the overall theme. Cora often feels the weight of her role as caregiver to Ruky, while Ruky’s innocence and happiness contrast with the darker elements surrounding them, reflecting the complexity of their experiences.