The table presents the percentage (%) market shares of smartphone operating systems (OS) in Great Britain (GB) and the United States (US) for January 2012 and July 2015. What does the table show about the changes between 2012 and 2015?
- AThe dominant firm in each country increased its market power.
- BThe firms counted in the three-firm concentration ratio remained the same in both countries.
- CThe three-firm concentration ratio decreased in both countries.
- DThe three-firm concentration ratio showed the same trend in both countries.