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 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.

A: D
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Q: [header] How to eat to improve fertility [title] Be aware that having a balanced, healthy diet does not guarantee higher fertility. [step] There are many online sources and several books that claim that switching to a more balanced and healthy diet can lead to improved fertility. Though it is always beneficial to eat a healthy diet, it should not replace other fertility treatments and options. <sep> (A) Making sure that you are eating adequate and not too many calories or trans fats can lead to strong, lasting health patterns. In order to see results, eating a balanced diet is essential. (B) The key to avoiding eating more fertility treatments is truly taking in proper nutrients and the exercises you perform regularly. [substeps] Vitamin b6, vitamin b12 and high quality foods like bread and fruits help you to relax and begin functioning properly. (C) [substeps] Healthcare providers believe that we often mistake pre-existing disease as the cause of our fertility problems. These people often mistake their diet as their only sources of positive energy. (D) However, maintaining a healthy diet and lifestyle may reduce a woman's risk of irregular ovulation and could improve her chances of getting pregnant. [title] Keep in mind fertility diets may only work for a small subsection of women.

A: D
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Q: A group of men are in a sandy desert. they <sep> (A) climb on top of camels and ride them. (B) are wearing rafts, and seated in them, they navigate the rough waters of a river. (C) are paddling through the water, using handgrips and oars. (D) are parasailing on the sea bed.

A:
A
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