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 identify shark teeth [title] Search for teeth at the tide line and the shoreline. [step] Go to the beach at low tide and look for the line of debris in the sand. Walk slowly along this tide line as you keep your eyes peeled for teeth. <sep> (A) The tooth for sharks that live in sandy waters is also known as the demon tooth and its characteristics are similar to those of sharks. This may be especially significant if you live in dense sand where there will be a lot of boulders and debris. (B) If the beach is busy, you might have more luck looking right where the waves are crashing into the shoreline so that you can snag teeth before others see them. [substeps] Every now and then, dig up some of the sand along the tide line and/or shoreline and search through it for teeth. (C) Once you see teeth appear on this line, you can get a sense of how they look. You can also use a body watch and watch your hands while you examine teeth. (D) [substeps] Fins with ribbons, lobster teeth, or koistriped teeth are more common than human teeth. [title] Look for shark teeth that have saliva on them.
Solution:
B