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 avoid the stomach flu [title] Wash your hands often. [step] Wash your hands carefully with soap and water for at least 20 seconds. Always wash your hands after going to the washroom and before and after handling food and eating. <sep> (A) Washing your hands is important, since if the way you handle and eat is bad (germs, bacteria, etc. ), your best chance at preventing the flu is by keeping your hands clean. (B) Don't attempt to dry or clean your hands on something other than a business table. [title] Wear long pants (not utility pants to wear running shoes with). (C) [substeps] It's a good idea to wash your hands between-and as many times as you go to the bathroom. This will help prevent an episode of nausea in the future, as well as allow your body time to shut down its internal defenses to fight off food, germs, and viruses. (D) This will help to prevent the spread of germs. Germs on your hands can get into your eyes, ears, and nose and make you sick.
D

[header] How to install a bakflip hd tonneau cover on a ford f150 [title] Place the rail of the bakflip hd on right hand side bed rail of the f150. [step] Slide the tonneau rail all the way forward to the bulk head. It is a good idea to have a squeeze clamp or similar to hold it in place. <sep> (A) [title] Slowly turn the bakflip over so it moves slowly, its going to wobble and have to be bent the opposite way of the rail. [step] Be prepared for a lot of bumping. (B) [title] Tightly wrap round tray socket on right hand rail over cover and fasten. [step] Compression disks complete a swivel mounted over rail. (C) [title] Place the included rail clamps in place. [step] Tighten with a wrench or socket. (D) This will prevent the oil from jumping up and down accidentally while the g2 is being painted. [title] Place the nikon bolt assembly inside the couplers cradle.
C

[header] How to change a upvc door lock [title] Identify the kind of lock you have. [step] There are different variations for upvc door locks, so initially, try to identify the brand of the lock on your door. Some common brands include avocet, fulltex gu ferco, mila, roto, and yale, just to name a few. <sep> (A) [substeps] Otherwise, try having someone walk in and lock your door for you. See if the locksmith can help you; by hiring someone else to do it, they should be able to reset it just like you can. (B) [title] Break the lock with a screwdriver. [step] After you have identified your specific brand of lock, breaking it by turning the screws in the opposite directions is the safest response. (C) [title] Check the expiration date on the door. [step] Some brand names will expire, so call the supplier after you check that model of lock. (D) Knowing the brand of the lock will help tremendously in finding a replacement lock. [substeps] Upvc door locking points can come in various styles (hook, deadbolt, pins, etc.

D