Which cars are using this roundabout correctly?

In a multilane roundabout or any other type of intersection, you must always follow road signs and pavement markings. Here, Car A is making a U-turn by correctly starting from the left lane. Car B is making a left turn by incorrectly starting from the right lane. [Roundabouts in Montana, Chapter 3 – Signs, Signals, & Markings, Montana Driver License Manual]