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 maintain leather shoes [title] Remove dirt with a soft cloth. [step] Rub off as much dirt and grime as you can with a clean, dry cloth. Try to scrape off any loose mud, for instance, and wipe away any excess salt. <sep> (A) [title] Fill a container with white vinegar or lemon juice. [step] Thin, still-clean, white vinegar has antibacterial properties that make applying the vinegar more effective. (B) [substeps] If you are working with other materials, like a paper towel, this method may take some time to complete. If necessary, have a friend help you finish the job. (C) [title] Apply a cleaner with a soft brush. [step] If the cleaner comes with an applicator top, use it to rub the cleaner into the shoe. (D) Continue cleaning the shoes until all the soap has been completely washed out. [substeps] Be very careful not to scrub your shoes too hard, as doing so could cause the shoes to crack or warp in their wear and tear.
C