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: A man demonstrates how to walk across and navigate a slackline in a grass courtyard in front of apartments. the man <sep> (A) demonstrates how to traverse a low brick fence on a residential street. (B) walks slowly across the slackline while talking and stopping to talk to passerbys. (C) stands on a slackline balancing himself with his arms before the clip cuts to him interviewing. (D) poles backward, glasses on and he begins to walk while holding the slackline while walking across the courtyard.
Example Output: C

Example Input: An intro screen appears and the text reads "expert series organic living" and at the bottom right there's a logo that reads geobeats, and the next blue screen displays the words "how to prune tomato plants?". a brunette woman <sep> (A) in a black shirt is raking leaves around the yard with a leaf blower. (B) is now talking while she's sitting outdoors near a large plant and the words on the screen say that her name is judy frankel, her title and her website. (C) displays a young boy who is standing in an antique shop, and two older children with each hand in a bag of what appears to be basil yarrow, baked beans, and the words " tomato plants " are in a blue screen with a number on it. (D) is now standing in front of a vegetable farm and is talking to the camera while holding up various hand tools as she holds them to instruct on the carrots.
Example Output: B

Example Input: [header] How to give your guinea pig a good, healthy diet [title] Select a good pellet. [step] Make sure the pellets you select have nutritional value. Plain pellets without any added seeds or colored treats should be selected. <sep> (A) For the most accurate results, choose pellets that are water-soluble but free of microorganisms. [substeps] Those with a good balance of nutritional value and nutrients should have pellets that will last a few months. (B) This ensures that your guinea pig will be eating the nutrients it requires without all the sugar and dangerous bits and pieces inside. [substeps] Use alfalfa based pellets for guinea pigs under 6 month old and timothy based pellets for older guinea pigs. (C) Healthy pellets may result in lower fiber levels and fewer fevers. Popular pellets to select for your guinea pig include : [substeps] Sheep pellets; sunflower seed; sesame seeds; and flax seeds. (D) Any pellets that are too small would be too high in calories and cause too much weight gain. [substeps] Rabbits can be picky eaters so make sure to give the pellets your rabbit is not fond of.
Example Output:
B