You will be given a definition of a task first, then some input 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 install foam bicycle tires [title] Let the air out of the pneumatic tire. [title] Insert a tire iron, or any tool with a slender handle and no sharp edges, under the lip of the tire. [substeps] Some companies include an installation paddle with the tires, or sell them separately. <sep> (A) [title] Pull the handle until the tire bolt-chain springs freely from the differential. [title] Locate an area that gets very little wind or rain. (B) Rub the handle between your hands, then raise them until they are parallel to the object, the tire fits perfectly when you put it in the proper position. Read the installation manual, and follow the directions on the product instructions. (C) [title] Flatten the tire 8-12 inches (20 cm). [step] Begin filling the tire's chamber at room temperature before you begin the installation. (D) If you don't have one, just find another long, durable object you can use as a lever. A tire iron or oversize screwdriver should work.
Output:
D