You will be given a definition of a task first, then an example. Follow the example to solve a new instance 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 create a christmas tree forest [title] Consider the type of tree you want to plant. [step] There are a wide variety of christmas trees and include fir, pine, spruce, cypress, and cedar. These trees thrive in different climates and look different from one another. <sep> (A) It is important to research the tree before setting up your tree to try it out to make sure you can write the tree's growing season so that you can get the most supplies you need. If you're just interested in having a tree stand out, then make sure to check for the following : [substeps] Spruce trees. (B) [substeps] Trees green may be used in a mix of green and evergreen. Greens, such as pintos and olive oil, may be more delicate than these. (C) Where the trees grow together is up to you. [substeps] Spruce trees light up the night for hours in the morning and drown out the morning sunrise between afternoons. (D) Think about where your tree forest will be located and choose a tree that can thrive in that climate. [substeps] Balsam firs are a popular christmas tree species that grow in the northern united states and canada, in hardiness zones 3-5 or states like minnesota, north dakota, and montana.
Solution: D
Why? This is a good example. Only option D is about Christmas trees. So, it's the correct option.

New input: [header] How to make a compost tea [title] Dechlorinate your tap water. [step] You'll need around 3 gallons (11 l) of water to make the tea. Let the water sit out in the sun and fresh air for several hours. <sep> (A) For the most satisfying tasting tea, dechlorination may be your choice. This is as simple as checking with a local water supplier. (B) Air humidifiers are best as they can collect water, but you can also buy air filtration devices to use if the time is right to dechlorinate your system. [substeps] Using a pot or kettle to dechlorinate the water can help dissolve debris in the water. (C) The organic product will help counteract the sulfates and ammonia, while reducing the taste of the mixture. If you're doing this yourself, check the package for instructions on how to dechlorinate the water. (D) This will allow any chlorine in the water to break down, because chlorine will kill the beneficial bacteria in the compost tea. [substeps] You don't have to aerate the water if you're using well water or another water source that doesn't contain chlorine.
Solution:
D