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: [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 is here: D
Explanation: This is a good example. Only option D is about Christmas trees. So, it's the correct option.

Now, solve this: [header] How to do stretching exercises at the computer [title] Depending on your dress for the day and public exposure (slacks work best for this exercise as opposed to a skirt or dress). [title] Bend the right knee and bring the knee to the chest. [title] Hold, grasping with both hands and pull up to the chest holding for five seconds. <sep> (A) [step] Go to the left and do the same thing with the left knee to the chest and hold with both hands for five seconds. [title] Do five of these, alternating each leg so that you have done ten each. (B) [title] At this time, moving forward, move to right to motion the right knee towards another leg joint. [title] Hold for five seconds without pulling back which will direct the leg to go forward, usually a daredevil. (C) [title] Stop once you feel the stretch in your knee muscles. [title] Relax your leg muscles (come fully upright) with a good smile on your face. (D) [step] Feel your heart rise and contract as you bring the knee up. [title] Slowly lower your right knee so that your right hip and your body weight is balanced, then bring both knees up.
Solution:
A