Giving partial credit for a so-so answer to a multiple choice question

I am working on a course that has been set up in Articulate Storyline 2.  I have 5 multiple choice questions scattered throughout the course. 

Due to the "soft" nature of some of the content, for each m-c question there is one REALLY GREAT answer, two ACCEPTABLE answers, and one answer that is REALLY WRONG. I want to give 20 points to the learner if they choose the really great answer, and 10 points to the learner if they choose one of the acceptable answers. But the way multiple choice questions are set up in Storyline, each answer is either right and gets full credit, or wrong and gets no credit. Is there a way to add a third category, so that I can give partial credit to one or two of the answers?

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