Given the task definition and input, reply with output. 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 work out on a playground as an adult [title] Walk on the balance beam. [step] Most playgrounds have wooden beams of various elevations. Even if there isn't a specific balance beam, you may be able to find a slightly raised surface or a curb that you can use for the same purpose. <sep> (A) [substeps] To start, walk with your legs out in front of you. To jump on the beam, lift one foot slightly off of the ground. (B) [title] Check for holes in the lower limbs or injured limbs. [step] Some young children will spring onto the beam as they fall and break their limbs through the drilled holes. (C) [substeps] Walk slowly at first until you find your balance. Turn and walk back slightly faster, then gradually increase your speed each time you cross. (D) Try swinging up and down in this position for a little of a challenge. Be careful not to knock over anything and risk hurting yourself if you fall.
C