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". 

[header] How to get rid of migraines [title] Learn all you can about migraines. [step] Nobody knows exactly what causes migraines. A lot of research has gone into the exact cause of migraines, but with little success. <sep> (A) People who experience migraines regularly have been having regular consultations with doctors and they still don't know what is causing them. Anything you experience requires some much-needed research or hypnosis to rule out any medical issues or underlying conditions. (B) Migraines result from a lack of sensory focal points or groups. They occur in fewer than three brain groups. (C) Just finding out what causes them will give you some tips on dealing with them. [substeps] Most people develop migraines because they have no symptoms or aren't able to respond to stimuli. (D) It is generally agreed upon that the trigeminal nerve plays a role in migraine pain. The trigeminal nerve is a cranial nerve that facilitates a major pain pathway.
D

[header] How to host a housewarming party [title] Make a guest list. [step] You should start keeping a guest list before you start working on the invitation. Be sure you include any friends, family, and coworkers that you would like to invite into your new home. <sep> (A) This will help ensure that the party is pleasant and enjoyable for your guests. Make sure that the guest list is segregated in different places. (B) [title] Decide ahead of time whether you will invite guests with a " weekly " or " annual " package. [step] You should also design and print out your invitations carefully and make sure they reflect how the party will look. (C) [substeps] Limit the guest list to the number of guests appropriate for the amount of space you have available. If you have a small space, consider hosting 2-3 smaller parties rather than one big one. (D) This way, parties are easier to plan without the need for many less specific guests. [substeps] Include guests that you know will be a good fit for your home's atmosphere.
C

[header] How to diagnose vertigo [title] Notice dizziness and feelings of imbalance. [step] Primary symptoms of vertigo include dizziness and a sense of imbalance. If you feel as though you are spinning or your environment is spinning, this suggests vertigo. <sep> (A) Both dizziness and imbalance can be separate; however, each of these symptoms have different negative effects on the person's blood glucose balance, nervous system and/or mood. People who experience vertigo in people with low blood glucose balance and who experience vertigo in people who are higher functioning are at risk of developing vertigo. (B) Feeling as though you are going to fall over or being unable to balance yourself also suggest vertigo. [substeps] These symptoms could be caused by inflammation of the vestibular cranial nerve, so it's important to visit your doctor and get a definitive diagnosis. (C) [substeps] Vertigo may manifest itself in small parts of the body such as the eyes, ears, nose, and mouth. Dizziness can change your focus in all directions as well, so it may be a sign that something is going on. (D) [substeps] Lightheaded people may experience dizziness and am lightheaded, while middle-aged women may experience vertigo and may feel that they are dizzy. Vertigo is frequently described as a symptom of motion sickness.

B