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 reflash bios [title] Download the bios update executable from the manufacturer website. [step] Read any instructions that come with the executable. Most executables will run fine whether they are loaded onto a floppy or a cd. <sep> (A) [substeps] You can download updates using your usb ports, using the icloud launcher, or by downloading the latest version of the app from the apple store. [title] Download the full version of the bios file you downloaded. (B) The instructions will let you know if a floppy isn't the recommended method. [substeps] If you don't know the manufacturer of your motherboard, you can use the online bios id manufacturer database to determine the exact make/model. (C) Make sure you follow all steps detailed in this article. [title] Access your bios update in full and play it. (D) If you don't have a cd in your system, purchase one from your internet retailer. Your download doesn't need to be a text file.
Output:
B