Detailed Instructions: 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".
Q: [header] How to choose a tablet computer [title] Look at what you currently use. [step] When it comes to buying a tablet, the main choice you will need to make is the operating system. The operating systems for tablets fall into three basic camps: apple (ios), google (android), and microsoft (windows). <sep> (A) You can buy tablets from all three camps. [substeps] Apple provides all the primary operating systems you can buy a tablet from, including windows xp or windows 7. (B) [substeps] Websites such as google +, google play, and google play are good sources for the larger list of operating systems. Most of these sites focus on websites that describe, without explicit details, all primary operating systems. (C) The one you pick will be based a lot on the kind of things you do on your regular computer and smartphone. [substeps] If you already have a smartphone with one of these operating systems, you may want to consider picking up a tablet running the same os. (D) Your operating system will be the third group on your list. There are several of them so be sure to look at all the different ones before settling on a one.
A:
C