Given the task definition, example input & output, solve the new input case.
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".
Example: [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.
Output: D
This is a good example. Only option D is about Christmas trees. So, it's the correct option.

New input case for you: [header] How to protect your village in clash of clans [title] Build walls effectively. [step] The first aspect to a great defense base in clash of clans using all of your walls, and using the walls effectively. At lower levels you won't have a lot of wall to build so you want to put your most valuable resources inside your walls. <sep> (A) [substeps] When building walls, avoid building wall walls because they can be heavy and will only create more loot for you. To defend yourself, build walls by using screens, floors, and mobs. (B) Troops with enough time will also help and prevent the enemy from using walls like apple, cabbage, and rice place to dig and dig for food and water. [title] Seek out completely different crafting structures. (C) [substeps] At the beginning of your village your three biggest resources are your elixir and gold storages, and your town hall. For defense minded players, the town hall is your most valued asset. (D) [substeps] Two strongest or strongest will be defense and defense. Each wall should have one higher or lower building.
Output:
C