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 bottle cap art [title] Choose your canvas. [step] You can use a regular thin canvas, or a thick wrapped canvas. A plank of wood from the craft store will also work. <sep> (A) Go for a light colored canvas so that you can use it for the finishing touch. You can also go entirely blank or have the canvas re-make itself, depending on how you want to be able to see everything you do. (B) Alternatively, you can use a thin piece of cardboard instead for a quick and inexpensive project. [title] Paint your desired canvas, then let the paint dry. (C) Avoid any finish or varnish, as it will cause a canvas to crack. Watercolors are best for this project because they won't affect the final product. (D) Make sure that the canvas is strong enough to withstand extended exposure. [substeps] You will need at least 2 feet in length to wrap.
B