Instructions: 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".
Input: [header] How to clean a guinea pig's fleece bedding [title] Remove feces and food debris. [step] At the end of each day, remove any loose stools or food you see on the bedding. You can use a plastic scoop, a small vacuum, or a small broom and dust pan. <sep> (A) [substeps] If needed, use a rubber mallet to punch holes in the fabric a few inches over the soiled bedding. [title] Select a proper disinfectant. (B) Clean all bedding surfaces to give guinea pigs fresh, healthy food. [title] Move any parts of the bedding. (C) [title] Give the bedding a trial run to see how comfortable it is for your guinea pig. [step] Set a trial run daily for two weeks to see how the bedding feels. (D) Pick up anything off the bedding that you can easily see. [title] Place loose hay in a single corner.
Output:
D