You need only to draw one marble, from the jar labelled ‘red and blue’.
If it is red, then since the label is incorrect, the jar contains only red marbles. Then the one labelled ‘blue’ does not contain all blues or all reds, so it contains some of both. This leaves the jar labelled ‘red’, which contains all blues.
If, on the other hand, you pull out a blue marble, then you can work out what’s in all the jars in the same way.