How to do partial scoring for one correct answer and two partially correct answers

Below is an image of the project I am developing. I am trying to setup the project, with partial scoring, so that if the learner selects answer G, they will receive all 6 points available. If they select answers B or D, they should still get a partial score of 3 points. 

When I go to the properties tab for each answer, I can assign the points that I wanted awarded for that answer. When I do this, it raises the total points available to 12 (6 for answer G, 3 for answer B, and 3 for answer D). I don't want the question to be worth 12 points. I hope this makes sense.