Final answer:
Option (1), Candace Whitcomb's organ playing and loud singing most likely create a joyful atmosphere that adds excitement and energy to the story, impacting its mood and tone.
Step-by-step explanation:
Candace Whitcomb's organ playing and loud singing are described as creating a certain atmosphere and having an effect on the story. Since the question lacks specific context regarding Candace Whitcomb's actions in the story, either a joyful atmosphere or a somber mood could be correct based on the information provided.
However, if her organ playing and singing are indeed loud and vibrant, it is more likely to create a joyful atmosphere; hence the first option (a joyful atmosphere; adding excitement and energy) would seem appropriate. This creates an atmosphere of excitement and energy, which can significantly impact the mood and tone of a story.