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 Q]: A machine draws a face on a pumpkin. the lights <sep> (A) and the paint on the pumpkin flicker. (B) turn off and it shows the carved pumpkin turned on. (C) flash as children shuffleboard across the pumpkin. (D) flash on and off.
[EX A]: B

[EX Q]: [header] How to find a penpal [title] Think about what you want to send. [step] There are many different ways to correspond with a penpal, and deciding on the one that's right for you makes it easier to sort through the number of penpal websites on the internet. Some people prefer communicating electronically while others like to use penpals as a means of creative communication. <sep> (A) [substeps] The international union of mail-artists is a website dedicated to those who like sending postal art to their penpals. Iumoa is a much more niche community as it has roughly 4 , 000 active members. (B) Read the different penpal websites carefully and decide on the one you wish to write a message for. [title] Enter the number and contact information you would like to use in the address bar (in the upper right hand corner of the web page). (C) [substeps] Remember that there is no set password to choose from across a thousands of websites, but feel free to use whatever feels most comfortable for you. [title] Narrow the search criteria to near the lowest classifications. (D) Some people like to send messages on social media or email, while other people prefer to send text messages or instant messages. [title] Decide which websites you want to find.
[EX A]: A

[EX Q]: [header] How to train a rottweiler [title] Learn about the breed. [step] Any person who owns a rottweiler should have a good basic knowledge about the breed. Not only will this help you train your rottweiler properly, but also keep it happy and healthy. <sep> (A) [substeps] Rottweilers typically are greyhaired and have coloration similar to other dogs, like a white type of dog, brown or brown. These breeds are generally always smaller than other breeds and tend to be slightly older. (B) [substeps] Well-bred rottweilers are large and athletic. Male rottweilers can grow up to 27 inches tall at the shoulder and weigh 100-135 pounds. (C) [substeps] Rottweilers are not bred for hunting. The entire dog population cannot be bred for hunting, but a purebred rottweiler proves to be a capable dog and combines many of the same characteristics and techniques. (D) Making your dog happy and healthy will allow you to bond with it and make him company. [substeps] The breed is composed of two different breeds: the wild kind and the feral breed.
[EX A]:
B