Q: 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 make saline solution to clean a wound [title] Wash your hands! [step] Before you begin cleaning and touching your wound, it is important that your hands are clean to prevent infection. Have a clean, dry paper towel easily accessible to prevent contamination of sterile hands. Wash your hands with soap and lukewarm water for 30 seconds. <sep> (A) Check the right contact for the amount of time indicated on the label. [substeps] Disinfect your hands, dry them, and any objects you may have touched with a mild or 100% antibacterial soap. (B) [substeps] In order to prevent contaminants from contaminating the environment, always use a sterile hand sanitizer. Do not use saline solutions that contain not 50% saline , 20% hydrogen peroxide, or 1% hydrogen peroxide. (C) [title] Soak a piece of breathable material in clean water and apply it to the wound. [step] You should choose non-abrasive materials, such as newsprint or commercial adhesives, because they have fewer risk of infection. (D) [substeps] Dirty hands may increase the likelihood of infecting your wound. To wash your hands thoroughly, scrub between your fingers, underneath your fingernails, and up past your wrists.
A:
D