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 input: [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 output: D
Example explanation: This is a good example. Only option D is about Christmas trees. So, it's the correct option.
Q: [header] How to keep ice from melting [title] Use a light colored container. [step] Look for a light colored cooler or ice bucket that is made of reflective material. Light colors absorb less heat, and will help to keep your ice from melting. <sep> (A) Dark colors will make it easier to move the cooler when storing foods and items. [substeps] It's also a good idea to use a dark glass container, no bigger than half an inch. (B) [substeps] A cooler or ice bucket made from nylon or styrofoam will keep the ice cool for at least the day. A plastic container will keep ice cool overnight, as long as it is not placed in direct sunlight. (C) Try not to overheat your cooler or ice bucket. This can cause frozen ice crystals to form, making your ice cooler [title] Wrap your ice cooler. (D) You can use transparent glass, ,, , or aluminum. However, ice can still freeze, so choose an opaque one.
A:
B