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 rid of dust mites in your mattress [title] Wash your bedding with hot water weekly. [step] Put your sheets, pillowcases, and blankets through the wash once a week. Wash them in water that is at least 130 f (54 c). <sep> (A) Use a mild detergent like laundry detergent or dish soap if you don't have fabric softener in your washing machine. [substeps] You should wash your sheets and pillowcases at least twice a week, so that you don't soak up all your cleaning the first time. (B) Make sure to wash all of your bedding once a week, or else the mites can get inside. [substeps] Use warm water and a detergent that is designated for bedding such as orange river or chamomile. (C) Pick the gentlest wash method for your bedding. This mild washing can keep bedding at its normal temperature without razor burn. (D) Cooler temperatures will not kill off the mites. [substeps] If you own bedding that cannot be washed hot, put it in the dryer for 15 minutes at 130 f (54 c) or higher to kill the mites.
D