It sounds like you should be using radio buttons, not check boxes. Check boxes can be selected independently of one another. With radio buttons, only one can be selected, which is what you want, I think.
After you have that you need a custom calculation script that checks the radio buttons' value, and sets the background color of the text field.
So something like:
if (this.getField("radiobutton").value==1) this.getField("textfield").fillColor = color.yellow;
if (this.getField("radiobutton").value==2) this.getField("textfield").fillColor = color.white;
(Pink is more complicated. You will need need to specify the complete color code)
Thanks Try. I'll give that a try, however do you know the command to fill the background of the whole document not just the field?
There's no such option, as far as I know.