You want to see conversion rates for Windows visits coming from London. Which of the following would you need to select?

You want to see conversion rates for Windows visits coming from London. Which of the following would you need to select?
  A)  City, and Goal Conversion Rate as a secondary dimension
  B)  Operating System, and City as a secondary dimension
  C)  Goal Conversion Rate, and City as a secondary dimension
  D)  any one of these options