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 stay up late without electronics [title] Drink caffeine. [step] Caffeine blocks neurotransmitters in your brain that make you sleepy. When you start to feel drowsy, reach for a cup of coffee or a soda. <sep> (A) Remember that caffeine loses its effectiveness with overuse. Try to save it for when you really need it. (B) Your body will start shutting down caffeine when you're outside and keep you awake by doing what it is meant to do. It can help you stay awake long enough to go to bed. (C) Though caffeine will not give you energy right before sleep, it will trigger the natural sleep signal that draws us into the world right before it hits. An caffeine-rich beverage will wake you up more, making your sleep better. (D) Coffee is the source of human sleepiness so drinking coffee or another caffeinated beverage before bedtime is important. Even an extra pill is a key lubricant.

Ex Output:
A

Ex Input:
As the female athletes continue their practice a man wearing a gym outfit gets interviewed while he stands in front of targets. finally a female athlete <sep> (A) is shown interviewing a man and she begins to demonstrate how to hit the bowling ball. (B) gets interviewed as the female athletes continue to practice archery. (C) approaches a green field and a man walks around her to introduce her. (D) connected to an indoor video begin she her throwing match.

Ex Output:
B

Ex Input:
[header] How to roll sod [title] Rent or purchase a lawn roller from a home supply store. [step] You can rent lawn rollers by the hour, day, or week. They cost about $18 ( 12) a day or $72 ( 51) a week. <sep> (A) Each brand of lawn roller fits onto two kinds of carpet. A good choice is a linoleum, hardwood, or vinyl carpet. (B) If you're planning on mowing your lawn, you'll need a pair of lawn roller. Make sure the product is compatible with your existing lawn roller to avoid overclocking your lawn. (C) These rollers are called cushions and have the benefit of being flat and easy to roll. [substeps] Consider checking out sites like ebay or elsewhere for your lawn roller rental website, though most will offer free rolls. (D) Residential law rollers range from about 24-36 inches (610-910 mm) wide, which works well for home landscaping projects. [substeps] If you are completing many landscaping projects, it may be more cost-effective to purchase your own.

Ex Output:
D