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 print pictures in black and white [title] Understand why you'd want to convert first. [step] While you can open any picture and quickly print it in black and white, you may want to use image editing software to convert it first. This will result in much better detail and shading, and will lead to more artistic photos. <sep> (A) [substeps] To do photo editing: download photo editing software, click the " file " menu below, choose file] upload, then choose export number. When you are ready to print, double-click on " save as " and enter your photo's 2-digit serial number. (B) [substeps] If you want to edit your camera page like this, then you'll need to print and print your pictures that are packaged with the picture. That means you'll need to use a different file format. (C) It may take a while to convert your first image, but once you get used to the process it will go much quicker. [substeps] If you don't want to convert the image and just want to print it in black and white, click here. (D) However, keep in mind you may be able to use different frames, or add pictures differently. In addition, you may need to take some time to learn how to create rich photographs.
Output:
C