Teacher:In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Teacher: Now, understand the problem? Solve this instance: [header] How to keep the nose moist to prevent nosebleeds [title] Use a humidifier. [step] You can use either a cool water humidifier or a vaporizer. When the air is very dry, any increase in humidity will help prevent a nosebleed. <sep> (A) Humidifiers tend to dehumidify more easily than a vaporizer, because they have low drying cycles. If you want the environment to become more dry, consider using a mist humidifier. (B) A combination humidifier is ideal for cold weather. Dry air can often interrupt the healing process and cause nosebleeds. (C) Moistening the air at night will also make it easier to breathe and to sleep. [substeps] If you don't have a commercial humidifier, you can make one by putting a pot of water on the radiator/heating in the winter. (D) Put the humidifier on for half an hour or two a day until the nosebleed subsides. [substeps] Make sure that the humidifier is not connected to any heat sources.
Student:
C