You will be given a definition of a task first, then some input of the task.
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 root beer [title] Sterilize anything that will touch your root beer. [step] This includes pots, funnels, tubes/siphons, measuring cups, and bottles. You can boil these items or simply run them through a dishwasher, as the high temperature will kill any unwanted bacteria. <sep> (A) ( you shouldn't touch the brew, but washing your hands is a good idea too. ) [title] Using a clean 2 liter (0.53 us gal) bottle and a dry funnel, add the ingredients in sequence as stated in the steps that follow. (B) [title] Make sure you have a small bowl or cup as well as a pot large enough to hold the beer. [step] Ideally, you would have a larger pot, but measuring cups are better. (C) You can also boil them in boiling water if the pot gets a bit wet. [substeps] It is wise to sterilize all pots, such as hand soaker or evening soaker. (D) [title] Measure the current volume of the beer into a measuring cup. [step] Change the measuring cup every three days or whenever you acquire your desired quality of beer.
Output:
A