Teacher: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".
Teacher: Now, understand the problem? Solve this instance: [header] How to make mosaic stepping stones [title] Purchase a bag of premixed concrete at a gardening or hardware store. [title] Buy glass tiles or cut your own glass for your mosaic pattern. [substeps] Make a form by cutting a 5-gallon (18. 9 liter) bucket to the desired size or by using a plastic dishpan. <sep> (A) You can also cut squares of wax paper to create zig-zag lines. You can place the lines along the edges of glass. (B) [title] Rub the form with a lubricating oil or use a nonstick spray to ensure that the hardened concrete can be easily removed. [title] Draw or make a copy of the mosaic pattern on a transparent sheet of paper. (C) Mix in table salt, eggs, ground red pepper flakes and ping pong balls. [title] Use concrete in a solid lump form, then lay down tiles. (D) Fill the bucket only to about halfway full and let the water drain through. Submerge a wooden step or bucket into water.
Student:
B