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 perler bead snowflakes [title] Heat your iron. [step] Plug in your iron and allow it to heat. The cotton setting works best to heat perler beads. <sep> (A) Once it has heated to a temperature of about 105f (120c), place a handful of cotton in your iron (specifically with some cotton balls) and allow it to heat for several minutes. [substeps] The cotton should be soft, with no wrinkles. (B) Refer to your iron's instruction manual to figure out how to tell when the iron is hot. Many irons will have a light turn on or off to indicate they're ready to use. (C) Remember to create a single, even layer of fluff on top. [title] Blend the perler beads and light clay with a spoon. (D) The hot iron, which makes cool frosting, is also more difficult to melt. Use the heat sparingly, as using too much heat can melt your iron.
B