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". 

Input: Consider Input: [header] How to change trackpad settings on macbook pro [title] Find the system preferences. [step] Starting from your main desktop screen there are two ways to find the system preferences where the mouse and touchpad settings will be located : [title] Bring your cursor to the bottom screen and find the system preferences application. [step] The icon looks like a box with three gears inside it. <sep> (A) Open that to find all your system preferences. [substeps] Alternatively, you can use the spotlight feature. (B) On macbook pro this icon resembles a round blue square with a horizontal green dot on it. On other applications this icon is actually a box with a gear, and is small in appearance. (C) It can be located on the taskbar or in the upper left-hand corner of the window. [title] Let the system preferences application perform its work. (D) [title] Click the customize key in the dialog box. [title] Follow the on-screen instructions to change the customization function.

Output: A


Input: Consider Input: [header] How to start using the pinnacle video transfer device [title] Examine the product, so, we have the rca inputs, which is s-video, composite video, and audio. [step] This is the analog in. The digital out has the usb2.com, and the power supply. <sep> (A) [title] Update the firmware of the video transfer. [step] To do this, download the latest firmware on a flash stick, plug the flash stick into the unpowered video transfer. (B) The power supply, also called this vtv plug-in, only has these types of input. [title] Find the vtv pedal, and go to start. (C) The processor is capable of using thousands of media. [title] At this to do that, go to the system tab and change the ios ip address (ios system). (D) It has no access to itunes fans, which is why it is difficult to network. Here's how to use the gadget.

Output: A


Input: Consider Input: A "trend routing technology" logo appears on screen. "knife sharpening using a diamond bench stone" appears. two men <sep> (A) are inside a gyre sitting on a bench sharpening knives while women wait outside in the stands ready and ready. (B) finely sharpen knives using a long sharpening knife. (C) discuss, and one appears with a white " chinese slanting " stone. (D) demonstrate sharpening a knife using a honing stone.


Output: D