Detailed 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".
Q: [header] How to make a holographic illusion pyramid [title] Gather your materials. [step] Most of the items you'll need will be laying around the house. For instance, you probably have some old cd cases around. <sep> (A) [substeps] If you don't have any cds, don't bother making all of the pieces. Instead, have your parents make the pieces. (B) If you don't have any old cd cases lying around, you could build your own. You can build some elaborate pyramids from cardboard blocks, but you need some big enough to sit on. (C) You'll also need tape or glue, graph paper, a pen, a ruler and a smartphone. [title] Map out the dimensions of the template on the graph paper. (D) If that's the case you want, there's no shame in having more! [title] Open the case and locate the hologram projector. [step] You can find it in a big metal locker in a convenience store.
A:
C