Final answer:
In the given passage, Mr. Smithers is described as being melancholic during the winter. The correct answer is 'slough'.
Step-by-step explanation:
In the given passage, Mr. Smithers is described as being melancholic during the winter. The passage uses the words 'sank into' to describe his state, which suggests a feeling of deep sadness or depression. The options for his state are litany, slough, both, or neither. Based on the passage, the correct answer is slough.