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". 

Example Input: [header] How to buy a last minute cheap flight [title] Check airline newsletters, websites that specialize in last minute air travel and the travel section of your local newspaper to find last minute deals on flights. [step] Sometimes you can save money by booking flights late because airlines that have not filled their planes will offer discount fares. [title] Compare airfares from different airlines, websites and travel agencies. <sep> (A) [step] Look at every airline's website so that you can compare and contrast prices. [title] Opt for free flights as before, otherwise follow the full booking program and you'll not miss your flight in a long time. (B) [step] Try booking flights from big-ticket airlines such as kiwi airlines and delta. [title] Compare prices from travel agencies that are offering cheaper flights. (C) [step] Purchasing flights directly from the airline is not always the cheapest deal, so check out a few different travel websites and travel agencies to compare prices. [title] Search for flights during undesirable days and times. (D) [step] Compare each airline's prices with the prices you are interested in. You might be able to find a cheaper flight for free.
Example Output: C

Example Input: [header] How to protect the copyright of a tv show or movie [title] Confirm that you are the rightful owner of the copyright. [step] Generally you have the right to claim a copyright in your work if you created it--unless it was a work-for-hire. If you were paid to create something for someone else, you can't claim the copyright. <sep> (A) [substeps] If you created your movie or tv show independently, you have a copyright in it. If you accepted funding from someone else or allowed someone else to produce your work, your production contract should state who owns the copyright in the work. (B) However, you must know if you created a work-for-hire from another source. [substeps] Before you do your homework, find out what rights are available to the creator of your television show or movie. (C) [substeps] You generally must prove that you created the work or movie on behalf of someone else--whether you are doing it for a business or company. Generally, you also must prove that the copyright interests the person or company you are seeking the copyright for. (D) However, you may be entitled to a copyright for any work created for another person, including newspapers and magazines. [substeps] In this situation, you may be able to claim something other than a copyright.
Example Output: A

Example Input: [header] How to make a sterile bacterial smear [title] Remove all unneeded equipment and objects from the lab bench. [substeps] Leaving objects on the lab bench can get in the way or be a safety hazard. Paper left on the bench can catch fire if a bunsen burner is knocked over. <sep> (A) [title] Squirt liquid disinfectant onto the lab bench. [substeps] Use a liquid disinfectant meant for hard surfaces, containing bleach or ethanol. (B) Leaving objects off your bench is the key to your success. Removing one item from the lab bench is not recommended unless you want to collect germs. (C) Put any food or also any cutlery or other items that may have been sitting on the bench away from where the patient is working. Sanitize hands, feet, clothing, and anything else in the area that would be touched by the patient. (D) Certain equipment, like gloves, will drop out of the solution and become a fire hazard and potentially lead to serious illness and death. Important objects to remove include any infected equipment you may have, poultry or other food items such as fruit or vegetables.
Example Output:
A