iOS – multiple selection

I have 3 values - A, B and C. The values can be selected in the following ways:

Select A only
Select A and B
Select A, B and C

~~The values used for A, B and C are large enough to not fit on screen.~~

Every value used for A, B and C are large enough to fit almost all horizontal space in screen.

What kind of UIView is better to achieve this goal? I was thinking about a vertical switch but I have no idea how to re-design a UIView.