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 get nice feet [title] Remove callouses and rough skin. [step] Feet often end up calloused or rough with time. If you want to improve your feet, you can smooth out your skin using an electronic callous remover, a foot file, or a pumice stone. <sep> (A) Nail files, while softer pads help soften the calluses faster, are hard to get rid of. [substeps] Get rid of callouses without an electronic callous remover by scrubbing them with talcum powder. (B) Use a pumice stone to buff away calluses and rough areas. [substeps] Dry, uncalloused feet are usually less painful than calloused feet, but their callouses are still too hard to remove. (C) [substeps] An electronic callous remover is a motorized device that you move over callouses and rough spots on the feet. It removes dead skin cells and shaves down the rough, outer layer of skin and leaves your feet smooth. (D) Stick the stone under the skin for the first 2 or 3 months. Then slowly work the callous away with moderate discomfort.
C