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.
Example solution: D
Example explanation: This is a good example. Only option D is about Christmas trees. So, it's the correct option.

Problem: [header] How to tell the difference between twins [title] Observe their facial features. [step] Twins often have different shaped eyes, jawlines, cheekbones, lips and other facial features, including moles or birthmarks on the opposite sides of their bodies that can help you tell them apart. You might also notice that one has a darker skin tone or complexion. <sep> (A) [title] Look closely at how their height differs. [step] You may discover that one twin is taller than the other, or tends to stand up a little straighter than his or her sibling. (B) [substeps] Twins may think that their noses are slightly too large or that they have more lips. They may also not have their noses closer than your own nose when in doubt. (C) Because twins are so closely related, the similarities often display between twins come from historical or cultural backgrounds. [substeps] Boys and girls typically have slightly different skin tones. (D) This can be a sign that your twins have different facial characteristics than you! It's best to get a blood test done so you can be certain. [substeps] Twins have fangs both above the lip and below their teeth.
Solution: A