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".

People are standing around a christmas tree. They put lights onto the christmas tree. they <sep> (A) decorate the tree as its decorated. (B) throw wrapping paper onto the tree. (C) begin to put decorations onto the christmas tree. (D) put march lights onto the tree as well.
C

[header] How to fall asleep if you are blind or visually impaired [title] Talk to your doctor. [step] If you are a blind or visually impaired person who is having trouble falling asleep, you should set up an appointment with your doctor. Ask your doctor to examine you for non-24, a sleep disorder that frequently affects visually impaired and blind people. <sep> (A) This can help you make a diagnosis and develop strategies to speed up your recovery. [substeps] Ask your doctor if sleep loss, depression, dyslexia, or dyslexia problems might be the issue and advice you need. (B) A doctor can make a diagnosis of a sleep disorder and understand your problem. Treatment of the sleep disorder based on the condition will help your doctor identify the underlying cause and decide how long it is necessary to treat you. (C) Your doctor may refer you to an optometrist or psychologist who has experience treating dementia or cognitive dysfunction. Your doctor may want to examine you in several places or diagnose various medical conditions. (D) [substeps] Non-24 is a disorder that affects your sleep-wake cycles and is common in blind people. People with non-24 have trouble falling and staying asleep at night, as well as extreme urges to nap during the day.
D

[header] How to tie a sarong [title] Fold the sarong diagonally. [step] Fold the materially diagonally in half to get a triangle shape. [title] Wrap the sarong around your waist. <sep> (A) [step] Fold towards your waist where it forms a t. [title] Pull the two sides together across the triangle. (B) [step] First, start near one top part and move across the rest of the fabric/sarong for the final shape. [title] Fold the sarong to a rectangle. (C) [title] Gather the two ends of the sarong and tie a knot on the side. [step] Do a second knot to secure, then fluff out the ends of the material. (D) [step] Any sections that meet at the waist should be close together; otherwise, the sarong may fall off one inch (2.54 cm). [title] Loop the fehnb (or front & back folds) together, making sure that the edges are aligned without overlapping.
C