Task: Text Completion
Input (English): [header] How to make a tornado in a bottle [title] Fill a plastic bottle with water. [step] Leave two inches of air at the top of the bottle. The size of the bottle doesn't matter-but the bigger the bottle, the bigger the tornado. <sep> (A) The larger the bottle, the more tornado you'll create with water, as well as the longer it might take for the tornado to spread and land on your person. [substeps] The size of the bottle also determines how you do it. (B) [substeps] Use a long, rectangular piece of black foil and make sure the triangle is even against one side of the bottle. Carefully measure and divide the dimensions of the bottle according to how many inches (24 x 22 centimeters) you want the tornado to be. (C) The bigger the tornado, the easier it will be to observe the effects on the water. [substeps] If you are only making a one-bottle tornado, you can use a plastic water bottle or a clear glass canning jar. (D) Use enough water so that the piece of glass that releases water is as tall as the funnel, but roughly over-the-top. [title] Place one end of the funnel in the bottle.
Output (English): C