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 get rid of the whitefly [title] Vacuum the flies. [step] Use a small hand vacuum, or hold the furniture-cleaning nozzle of a standard vacuum cleaner. Walk around your infested plants and suck the pests from the undersides of the leaves and foliage. <sep> (A) This method is quick and straightforward, and it can remove whiteflies from all stages of the development cycle-from larvae to mature, plant-munching adults. Vacuuming is most effective as soon as you notice an infestation. (B) [substeps] Lice/hornets that have infested the insect where possible will probably cause an infestation when they have access to this species. Lice and hornets can be pregnant bees or even cobwetters. (C) [substeps] Once you've vacuumed up all of the insects, you can dismantle the insect and wash it off. Plant diseases like freeze burn-gas are very likely to have mites, fungus, or other biological problems with this insect. (D) [substeps] If possible, clean the potted plants as a habit to keep the insects away. [title] Tear off the hard outer leaves once the insects have died.

Ex Output:
A


Ex Input:
[header] How to download microsoft office 2010 [title] Visit the office 2010 download page. [step] Microsoft office can be legally downloaded from microsoft's website as long as you have a valid 25-character product key. To find it easily, search for " using your office 2010 product key ". <sep> (A) [substeps] If you don't have a csso account, you may have to create one. You will need to verify your identity with microsoft office 2010. (B) [substeps] Office 2010 is no longer available for purchase or as a trial from microsoft. You can still buy boxed copies from other retailers. (C) [substeps] Leave one or more lines between the tabs on the homepage and the window you will be downloading to provide information about what you want to download. [title] Open the primary file you wish to download. (D) [title] Enter the windows code to install microsoft office 2010. [title] Click on the save file to run the pc then re-open microsoft office 2010 now to continue.

Ex Output:
B


Ex Input:
[header] How to use an ultrasonic cleaner to clean your jewelry [title] Fill the tank of your cleaner with water adding a tablespoon of ammonia. [step] Don't use too much because it can be harmful. [title] Add some dishwashing liquid, and you are done. <sep> (A) [title] Once you have filled your cleaner tank, add some water if needed. [step] Test it on a small portion of your jewelry. (B) [title] Turn on the cleaner and let it run without any items for 5-10 minutes so that the solution gets mixed well. [title] Put your item (s) into the tank. (C) [step] A couple splashes with a tank water mister or jar, may be enough, or 3 packets of heavy duty dish detergent. [title] If you are using a siphon you will need a length of clean, clean tubing or something with handles. (D) [title] Mix in some hydrogen peroxide if you don't have an iodine-based cleaner. [step] [title] Fill a syringe or needle-any type of syringe can work [title] Transfer the solution to your cleaning sponge.

Ex Output:

B