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".
Q: [header] How to train a deaf puppy [title] Learn how to get the dog's attention. [step] Thumping on the floor as you approach the puppy will usually work, since even deaf animals can feel vibrations. Flicking the light switch on and off is another option. <sep> (A) A flashlight is useful if you let your dog into an enclosed yard at night and need to call it back. [substeps] Vibrating collars are available that will let you get the dog's attention with a remote control. (B) [title] Sing or talk to the dog as you approach. [step] Waving your hands is also another way of drawing the dog's attention and keeping it engaged. (C) It can help your puppy understand what's going on in the room, and also can prevent the door from banging. [substeps] While it may help you to get the puppy's attention with the bang, a clapping ring prevents this tactic from working. (D) To work up a sweat, scream at the top of your lungs and run towards your deaf dog. [substeps] It's best to try this with the puppy a few times a day.
A:
A