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".

Ex Input:
[header] How to clean a vornado fan [title] Clean out dust in the outer grills using a vacuum cleaner brush. [step] You can use a brush attachment on a vacuum cleaner to clean out all of the dust from the outer grills. Make sure the fan is unplugged before vacuuming. <sep> (A) [title] Place a cleaning rod in each section of the fan and squirt some cleaning fluid through each rod. [step] Avoid getting any grease in the vents or rest tray. (B) Some of the cleaner should be removed from the outside if you use a cloth and brush as cleaning instructions are laid out in the manual. [substeps] Avoid cleaning the outer grills with dust because it can detach some of the insulation and contribute to the fan's cooling. (C) Wipe down the inside of the cover every few minutes so you can put the fan back together. [substeps] For maximum efficiency, you should wash your vornado fan at least once a month, which is right after each dry run. (D) Go slowly when vacuuming to ensure you clean out as much dust as possible. [substeps] This will only clean the outer part of the fan, not the inside blades.

Ex Output:
D

Ex Input:
[header] How to avoid water retention [title] Have a healthy diet. [step] Ensuring you have a healthy, balanced diet is a good first step to avoid water retention. Water retention can occur due to imbalances in your diet, deficiencies of some vitamins and minerals, and having too much salt. <sep> (A) One study found that people with excess salt = no water retention. " imbalance " can add up as a reason for water retention and include making it much more difficult to stay hydrated. (B) Excess salt raises your blood pressure, resulting in inaccurate results. Look for foods that are low in salt and low in water. (C) Eating a balanced diet will help to reduce the chances of water retention occurring due to these issues. [title] Eat food that is rich in potassium. (D) [substeps] If you have recently cooked or baked a meal, make an effort to change your recipe one day. This can help your body prevent the retention.

Ex Output:
C

Ex Input:
[header] How to lead small groups [title] Create a plan or agenda. [step] Your small group may be discussing an issue, solving a problem, or sharing personal problems. Make a list of what the group wants to accomplish, and break it down into specific tasks or discussion points. <sep> (A) Try to motivate your group through advice. [substeps] Write down an email or phone message for every person who shares your thoughts. (B) The agenda could include topics like fundraising, establishing sponsors, creating a space for the weekly meeting, or notifying the non-group of important topics. [substeps] You can create a list of required events, meetings, topics, or group activities by putting them into a notepad or by microlining them. (C) If you're not sure how long each task will take, organize the discussion so the most important tasks are first on the group's agenda. Write down notes using the steps below, to help guide you through the facilitation process. (D) Having a grasp of what is expected of you is important. Organize tasks as soon as you have them, and keep them until you are certain that you can accomplish the goals.

Ex Output:
C