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". 
One example is below.
Q: [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.
A: D
Rationale: This is a good example. Only option D is about Christmas trees. So, it's the correct option.
Q: [header] How to grow your fingernails [title] Wash your hands with a gentle soap. [step] Using a harsh soap may make your nails brittle. [title] Pat your hands using a towel. <sep> (A) [step] [title] You could also rub baking soda to make them into little balls and then brown them if necessary. [step] This is not necessary for your nails, but could make them grow. (B) [step] This will hold off the growing process. [title] Gently arrange your cuticles in order. (C) [step] Give each hand a chance to dry before moving onto your next step. [title] Take a fine-bristled brush or a soft cloth. (D) [title] Fill a plastic bowl with enough white vinegar to cover your nails. [title] Soak your nails (one hand at a time) in the vinegar for 4-5 minutes, while your other hand holds the bowl steady.
A:
D