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:
A man holds a pair of boots while talking and showing dirty parts. then <sep> (A) , he ankle many large tiny cuts of wood on the floor. (B) , the man replaces some parts by cutting the shoes and cleanser. (C) , the man puts paste on the boots, then he puts the shoes on. (D) , the man put a clothe inside the boot and brush the shaft of the boot thoroughly.

Ex Output:
D


Ex Input:
[header] How to clean a vornado fan [title] Clean out dust in the outer grills using a vacuum cleaner brush. [step] You can use a brush attachment on a vacuum cleaner to clean out all of the dust from the outer grills. Make sure the fan is unplugged before vacuuming. <sep> (A) [title] Place a cleaning rod in each section of the fan and squirt some cleaning fluid through each rod. [step] Avoid getting any grease in the vents or rest tray. (B) Some of the cleaner should be removed from the outside if you use a cloth and brush as cleaning instructions are laid out in the manual. [substeps] Avoid cleaning the outer grills with dust because it can detach some of the insulation and contribute to the fan's cooling. (C) Wipe down the inside of the cover every few minutes so you can put the fan back together. [substeps] For maximum efficiency, you should wash your vornado fan at least once a month, which is right after each dry run. (D) Go slowly when vacuuming to ensure you clean out as much dust as possible. [substeps] This will only clean the outer part of the fan, not the inside blades.

Ex Output:
D


Ex Input:
[header] How to report a kidnapping [title] Contact local law enforcement. [step] If you know or suspect that someone has been kidnapped, contact your local law enforcement agency immediately. The police or sheriff's department will take the information you provide and investigate the situation. <sep> (A) [substeps] If possible, get a police report by phone or in person at the police station. The actual contact information for the person you suspect has been kidnapped will vary from state to state. (B) They can also contact the fbi or other agencies if necessary. To make a report, call 911 or contact the agency directly. (C) Once you've provided sufficient information, a local police officer may begin to investigate the situation. It usually takes a few minutes for a local officer to do this. (D) [substeps] Bring the date and time of the abduction to the attention of local law enforcement agencies. Bring any information you have about the person with the stolen vehicle as well.

Ex Output:

B