Keeping this in consideration, what is the sweet hereafter about?
A small mountain community in Canada is devastated when a school bus accident leaves more than a dozen of its children dead. A big-city lawyer (Ian Holm) arrives to help the survivors' and victims' families prepare a class-action suit, but his efforts only seem to push the townspeople further apart. At the same time, one teenage survivor of the accident (Sarah Polley) has to reckon with the loss of innocence brought about by a different kind of damage.
Similarly, why did Nicole lie in the sweet hereafter? Her father seeks to sue the company that manufactured the bus that caused the accident and for that it is necessary to prove that the accident was caused by the malfunctioning of the bus. Yet, Nicole lies that it was Dolores' fault that the accident happened and there is no need for trial.
Besides, where does the sweet hereafter take place?
Upstate New York
What is the significance of the novel's title What is the sweet hereafter?
The "Sweet hereafter" is the idiomatic way to refer to heave, so that explains why the correct answer is B "A beautiful place the dead go, like heaven". In reference to the novel's title, we can see how this is related owing to the fact that the narrator is telling his story after an accident in which he almost die.