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 use a manual typewriter [title] Slide the margin set on the right-hand side of the typewriter. [step] Before you start typing, you'll want to make sure that your margins are set correctly. The right-hand margin set is usually located next to the larger carriage release lever at the top right of the typewriter. <sep> (A) [substeps] If you're typing to a computer and don't have the right-hand margin set, you can still specify the margins manually while writing. [title] Set the margins on the lower right as they indicate desired. (B) [substeps] Slide the margin set on the left-hand side of the typewriter away from the carriage release lever. A household typewriter may use this lever to move the carriage from side to side. (C) This indicates how you'll move your typewriter along its fine carriage. After setting up the margins, you may do an isolated margin set by turning the knobs on the right-hand wheels towards the opposite vertical carriage control. (D) The margin sets usually look like metal brackets at the very top of the typewriter. They may have a button you have to press before you can move them.
D