Final answer:
The correct answer is option A, meaning the challenging task Nathan faces is close to completion, and he feels optimistic. The metaphor 'light at the end of the tunnel' indicates nearing the end of a difficult journey with a positive outlook.
Step-by-step explanation:
The correct answer is option A: The job is nearly complete, and Nathan is optimistic about finishing it. The metaphor 'seeing the light at the end of the tunnel' typically means that a long and challenging task is close to being finished, and there is finally a sign of completion or success on the horizon. This phrase also implies a sense of optimism, as 'the light' is a positive symbol representing the end of a difficult period or the resolution of a complex situation.
When this metaphor is used, it often conveys the feeling of relief that one experiences when a task that seemed lengthy and arduous is nearing its end. It might also suggest that even though the task is not fully completed, the hardest part is likely over, similar to the state where Nathan finds himself in the provided sentence.
In the various texts provided, the idea of overcoming a challenging phase and approaching a better situation or 'light' is a common theme, which aligns with the interpretation of the metaphor in the context of the question.