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".
Q: [header] How to make a simple cat's bed [title] Pick out a cardboard storage box the right shape and size for your cat. [step] Cats feel the cold more than humans so it will help your cat stay warm by providing great insulation from the cold, as well as a safe space to retreat and relax in. You can buy cardboard boxes in a variety of colours, floral, vintage or modern designs. <sep> (A) This lets you choose one to suit your personal choice for your home decor. Alternatively you can simply use a cardboard box from the supermarket or local store. (B) [substeps] Cardboard boxes can be purchased at craft stores, baby stores, and specialty stores. [title] Check for good insulation materials such as polyurethane or adhesives. (C) [title] Go to the yard store and buy a white cardboard box. [step] Cardboard boxes are very cheap so you can buy them at far around the dollar. (D) [title] Assess your cat's overall health. [step] The signs of illness in cats include yellowing of the skin, dark circles under the eyes, loss of appetite, lethargy and decreased hunger.
A:
A