Instructions: 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".
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.
Output:
B