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 swat a fly without a fly swatter [title] Slap the fly with one hand. [step] Swat a fly by trapping it between one hand and a hard, flat surface that you have gotten it to land on. Move slowly toward the fly, then slap it quickly and firmly with your hand. <sep> (A) A very light slap like this works well to send the fly flying, but even a smack would work very well depending on the fly's size. [substeps] Using a fly swatter should be enough to remove the fly fly from your hand. (B) The movement of your slap will force it to land on the floor, suggesting that you are probably right for it. [substeps] If the fly lands on the ground instead of a tough surface, you've caught it mid-flight or might have hit it again. (C) [substeps] Approach the fly very slowly until you are within an arm's length of it. Keep your arm still until you are in position, then move it as quickly as possible in one motion toward the fly to hit it. (D) Repeat this until the fly lands quickly and you can swat any fly quickly. You may not get to swat very easily, but most people do.
Solution:
C