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 make a coloring book for young children [title] Decide on the book's size. [step] The most convenient dimensions for your book are 8.5 x 11 ", or standard size copy paper. Most commercially-made coloring books fit those proportions, so children are already accustomed to the size. <sep> (A) [substeps] Select the size you want your book to be. For example, a 15-inch book for a 14-inch child might be made of 11 1/2-1.8 ". (B) A smaller book may be incredibly difficult for younger children to read and understand. [title] Purchase the supplies and materials to make the photo book. (C) However, there are many variations and ranges when it comes to a coloring book, including : [substeps] Child-sized. This will include different colors, shapes, and sizes, such as blue, green, orange, purple, and indigo. (D) Also, if you're stumped coming up with your own illustrations, you'll have the option of printing new designs off of the internet and adding them to your book later. [title] Determine how many pages your book will be.
Output:
D