Detailed Instructions: 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".
Q: [header] How to clear your lungs after quitting smoking [title] Drink lots of fluids, especially water. [step] Drinking water will help your body to combat the congestion by thinning the mucus in your lungs and make it easier to cough up the mucus. It will also keep your body hydrated. <sep> (A) Drink an amount of water that is 12 to 24 ounces (226 to 113 ml) for the most reliable results. [substeps] Drinks throughout the day are generally the best thing to drink in the morning. (B) [substeps] You can also add a cough suppressant to water to help you relax while you are working to blow your nose. Make sure to drink hot, caffeinated drinks like coffee, tea, energy drinks, and milk instead of water. (C) This will also make it easier to cough up mucus. Water may also be a good source of sebum in your system because it means adding lots of water to your daily water intake, increasing blood flow to your lungs and respiratory system. (D) [substeps] Tobacco smoke slows the movement of the tiny hairs (known as cilia) that line our lungs and help to remove mucus. When you stop smoking, these hairs become more active and start to clear away the mucus built up in your lungs.
A:
D