You will be given a definition of a task first, then some input of the task.
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 clean keens [title] Use a stiff bristle brush to remove lose dirt. [step] Scrub the outside of your keens, including the tread, to remove lose dirt and debris. Scrub them until all of the dirt and debris are removed. <sep> (A) Make sure your brush is consistently clean and not contaminated. [title] Loosen any bond with the rummy leaves. (B) [title] Clean your keens at least once each week. [step] If you clean them too often, or if you give them too much scrubbing, they will dry out and become smelly. (C) [substeps] Additionally, place them under cold, running water to further remove loose dirt and dust before you place them in the washing machine. [title] Place a tablespoon (15 ml) of detergent into your washing machine. (D) Use a nylon head brush to give them a good scrub. [substeps] Be careful to only use these brushes on the brass keens, as the material may be damaged from the wax.
Output:
C