Given the task definition and input, reply with output. 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".

[header] How to choose healthy treats for a senior dog [title] Offer your senior dog raw vegetables. [step] Senior dogs are at a higher risk for obesity and weight issues. You can help your older dog stay healthy and at an ideal weight by giving them raw vegetables as treats. <sep> (A) Offer a single or two servings of vegetables, like strawberries, raw broccoli, and frozen chicken breast. You can also replace the veggies with dried fruits, like dandelion. (B) Raw vegetables are ideal for dogs under the age of 6 months old and younger. Try offering leafy greens, brussels sprouts, asparagus, cabbage and leafy green vegetables as treats. (C) Make sure the vegetables are cut into small pieces and only give them one treat at a time. Baby carrots, green beans, and broccoli are all good treat options for your pup. (D) [substeps] Older dogs generally are lower in calcium and phosphorus, which is an important part of their health. Raw vegetables include spinach, cashews, beans, corn, cabbage, onions, squash, carrots, broccoli, brussels sprouts, legumes, and beet.
C